This commit was generated by cvs2svn to compensate for changes in r2637,svn2git-root

which included commits to RCS files with non-trunk default branches.

svn path=/trunk/externals/iem/iemmatrix/; revision=2638

29 files changed, 3849 insertions, 0 deletions

diff --git a/src/Makefile.in b/src/Makefile.in
new file mode 100644
index 0000000..bbb76c5
--- /dev/null
+++ b/src/Makefile.in
@@ -0,0 +1,80 @@
+LIBNAME    =iemmatrix
+
+PREFIX     =@prefix@@PDLIBDIR@
+
+INSTALL_BIN=$(PREFIX)/extra
+INSTALL_DOC=$(PREFIX)/@REFERENCEPATH@$(LIBNAME)
+
+EXT = @EXT@ 
+DEFS = @DFLAGS@
+IFLAGS = -I. @INCLUDES@
+
+CC = @CC@
+LD = @LD@
+AFLAGS = 
+LFLAGS = @LFLAGS@
+WFLAGS =
+
+TARNAME =  $(LIBNAME)-@IEMMATRIX_VERSION@.tgz
+
+.SUFFIXES: .$(EXT)
+
+PDCFLAGS = -g -O2 $(DEFS) $(IFLAGS) $(WFLAGS) $(LFLAGS) $(AFLAGS)
+CFLAGS = -g -O2 $(DEFS) $(IFLAGS) $(WFLAGS)
+
+LIBS = @LIBS@
+#LIBS = -lpthread -lm -lc 
+include Make.source
+TARGETS = $(SOURCES:.c=.o)
+
+
+all: $(LIBNAME)
+	cp $(LIBNAME).$(EXT) ..
+
+$(LIBNAME): $(TARGETS)
+	$(LD) $(LFLAGS) -o $(LIBNAME).$(EXT) *.o $(LIBS)
+	strip @STRIPFLAGS@ $(LIBNAME).$(EXT)
+
+.c.o:
+	$(CC) -c -o $@ $(CFLAGS) -DPD $*.c
+
+# cp $@ $*_stat.o
+
+.o.$(EXT):
+	$(CC) -o $@ $(PDCFLAGS) -DPD $*.o
+
+
+clean:
+	-rm -f *.$(EXT) *.o 
+
+cleaner: clean
+	-rm -f *~ _* config.*
+
+cleanest: cleaner
+	-rm -f Makefile ../*.$(EXT) Make.source
+
+distclean: cleanest newmakefile
+
+install: install-bin install-doc
+
+install-bin:
+	-install -d $(INSTALL_BIN)
+	-install -m 644 $(LIBNAME).$(EXT) $(INSTALL_BIN)
+
+install-doc:
+	-install -d $(INSTALL_DOC)
+	-install -m 644 ../doc/*.pd $(INSTALL_DOC)
+
+dist: all cleaner
+	(cd ../..;tar czvf $(TARNAME) $(LIBNAME))
+
+everything: clean all install distclean
+
+newmakefile:
+	echo "current:">Makefile
+	echo "	./configure && make">>Makefile
+
+source:
+	echo "SOURCES = \\"> Make.source
+	echo `ls mtx_*.c $(LIBNAME).c` >> Make.source
+	echo >> Make.source
diff --git a/src/configure.in b/src/configure.in
new file mode 100644
index 0000000..9afbf9e
--- /dev/null
+++ b/src/configure.in
@@ -0,0 +1,193 @@
+dnl Process this file with autoconf to produce a configure script.
+AC_INIT(iemmatrix.c)
+
+dnl Checks for programs.
+AC_PROG_CC
+
+AC_SUBST(STK)
+AC_SUBST(DFLAGS)
+AC_SUBST(LFLAGS)
+AC_SUBST(EXT)
+AC_SUBST(LD)
+AC_SUBST(STRIPFLAGS)
+AC_SUBST(IEMMATRIX_VERSION)
+AC_SUBST(REFERENCEPATH)
+AC_SUBST(PDLIBDIR)
+AC_SUBST(INCLUDES)
+AC_SUBST(SOURCES)
+
+
+AC_ARG_WITH(pdversion, [  --with-pdversion=<ver>  enforce a certain pd-version (e.g. 0.37)])
+
+if test $includedir
+then
+ for id in $includedir
+ do
+   if test -d $id
+   then 
+    INCLUDES="-I$id $INCLUDES"
+   fi
+ done
+fi
+
+dnl Checks for libraries.
+dnl Replace `main' with a function in -lc:
+AC_CHECK_LIB(c, main)
+dnl Replace `main' with a function in -lm:
+AC_CHECK_LIB(m, main)
+dnl Replace `main' with a function in -lpthread:
+dnl AC_CHECK_LIB(pthread, main)
+dnl Replace `main' with a function in -lstk:
+dnl AC_CHECK_LIB(stk, main, STK=yes)
+
+dnl Checks for header files.
+AC_HEADER_STDC
+AC_CHECK_HEADERS(stdlib.h stdio.h string.h math.h time.h sys/time.h)
+
+dnl Checks for typedefs, structures, and compiler characteristics.
+AC_HEADER_TIME
+
+dnl Checks for library functions.
+AC_FUNC_MMAP
+AC_CHECK_FUNCS(select socket strerror)
+
+
+LD=ld
+DFLAGS=""
+
+dnl
+dnl  OK, checks for machines are here now
+dnl
+if test `uname -s` = Linux; 
+then
+  LFLAGS="-export_dynamic  -shared"
+  EXT=pd_linux	
+  STRIPFLAGS="--strip-unneeded"
+fi
+
+dnl This should use '-bundle_loader /path/to/pd/bin/pd' instead of'-undefined suppress'
+dnl then strip might do something
+if test `uname -s` = Darwin; 
+then
+  LD=cc
+  LFLAGS="-bundle -undefined suppress -flat_namespace"
+  EXT=pd_darwin
+  STRIPFLAGS=
+  if test "$enable_lpt" = "yes"; then
+    AC_MSG_ERROR("lpt not supported on this platform");
+  fi
+  if test "$enable_lpt" = ""; then
+    AC_MSG_WARN("lpt not supported on this platform - disabling");
+    enable_lpt="no";
+  fi
+fi
+if test `uname | sed -e 's/^MINGW.*/NT/'` = NT; 
+then
+  LD=gcc
+  INCLUDES="-I@prefix@/src"
+  DFLAGS="-DMSW -DNT"
+  LFLAGS="-shared @prefix@/bin/pd.dll"
+  EXT=dll
+else
+  PDLIBDIR="/lib/pd"
+  LIBS="-lc -lm"
+fi
+if test `uname -s` = IRIX64; 
+then
+  LFLAGS="-n32 -DUNIX -DIRIX -DN32 -woff 1080,1064,1185 \
+	-OPT:roundoff=3 -OPT:IEEE_arithmetic=3 -OPT:cray_ivdep=true \
+        -shared -rdata_shared"
+  EXT=pd_irix6
+  dnl DFLAGS="-DUNIX -DIRIX6"
+  STRIPFLAGS="--strip-unneeded"
+  if test "$enable_lpt" = "yes"; then
+    AC_MSG_ERROR("lpt not supported on this platform");
+  fi
+  if test "$enable_lpt" = ""; then
+    AC_MSG_WARN("lpt not supported on this platform - disabling");
+    enable_lpt="no";
+  fi
+fi
+
+if test `uname -s` = IRIX32; 
+then
+  LFLAGS="-o32 -DUNIX -DIRIX -O2 
+         -shared -rdata_shared"
+  EXT=pd_irix5
+  dnl DFLAGS="-DUNIX -DIRIX5"
+  STRIPFLAGS="--strip-unneeded"
+  if test "$enable_lpt" = "yes"; then
+    AC_MSG_ERROR("lpt not supported on this platform");
+  fi
+  if test "$enable_lpt" = ""; then
+    AC_MSG_WARN("lpt not supported on this platform - disabling");
+    enable_lpt="no";
+  fi
+fi
+
+dnl Checks for pd-version, to set the correct help-path
+AC_MSG_CHECKING("pd\>=0.37")
+
+if test "$with_pdversion" != ""
+then
+echo -n "($with_pdversion)... "
+  PD_VERSION="$with_pdversion"
+else
+cat > conftest.c << EOF
+#include <stdio.h>
+#include "m_pd.h"
+int main(){
+  printf("%d.%d\n", PD_MAJOR_VERSION, PD_MINOR_VERSION);
+  return 0;
+}
+EOF
+ if $CC $INCLUDES -o conftest.o conftest.c > /dev/null 2>&1
+ then
+  PD_VERSION=`./conftest.o`
+ else
+  PD_VERSION=""
+ fi
+fi
+
+let PD_MAJORVERSION=`echo $PD_VERSION | cut -d"." -f1`+0
+let PD_MINORVERSION=`echo $PD_VERSION | cut -d"." -f2`+0
+
+if test "$PD_MAJORVERSION" -gt 0 || test "$PD_MINORVERSION" -ge 37
+then
+  REFERENCEPATH=extra/help-
+  echo "yes"
+else
+  REFERENCEPATH=doc/5.reference/
+  echo "no"
+fi
+
+dnl check for iemmatrix-version (but why...)
+AC_MSG_CHECKING("iemmatrix-version")
+cat > conftest.c << EOF
+#include <stdio.h>
+#include "iemmatrix.h"
+int main(){
+  printf("%s\n", VERSION);
+  return 0;
+}
+EOF
+
+if $CC $INCLUDES -o conftest.o conftest.c > /dev/null 2>&1
+then
+  IEMMATRIX_VERSION=`./conftest.o`
+  echo "$IEMMATRIX_VERSION"
+else
+  IEMMATRIX_VERSION=""
+  echo "(unknown)"
+fi
+
+echo "SOURCES = \\"> Make.source
+for i in `ls mtx_*.c iemmatrix.c`
+do
+  echo "	$i\\">> Make.source
+done
+echo >> Make.source
+
+AC_OUTPUT(Makefile)
+
+rm -f conftest.*
diff --git a/src/iemmatrix.c b/src/iemmatrix.c
new file mode 100644
index 0000000..384f54a
--- /dev/null
+++ b/src/iemmatrix.c
@@ -0,0 +1,77 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+void mtx_binops_setup();
+void mtx_col_setup();
+void mtx_diag_setup();
+void mtx_diegg_setup();
+void mtx_egg_setup();
+void mtx_element_setup();
+void mtx_eye_setup();
+void mtx_inverse_setup();
+void mtx_matrix_setup();
+void mtx_mean_setup();
+void mtx_check_setup();
+void mtx_print_setup();
+void mtx_ones_setup();
+void mtx_pivot_setup();
+void mtx_rand_setup();
+void mtx_resize_setup();
+void mtx_roll_setup();
+void mtx_row_setup();
+void mtx_scroll_setup();
+void mtx_size_setup();
+void mtx_trace_setup();
+void mtx_transpose_setup();
+void mtx_zeros_setup();
+void mtx_tilde_setup();
+
+void iemtx_setup(){
+  mtx_binops_setup();
+  mtx_col_setup();
+  mtx_diag_setup();
+  mtx_diegg_setup();
+  mtx_egg_setup();
+  mtx_element_setup();
+  mtx_eye_setup();
+  mtx_inverse_setup();
+  mtx_matrix_setup();
+  mtx_mean_setup();
+  mtx_check_setup();
+  mtx_print_setup();
+  mtx_ones_setup();
+  mtx_pivot_setup();
+  mtx_rand_setup();
+  mtx_resize_setup();
+  mtx_roll_setup();
+  mtx_row_setup();
+  mtx_scroll_setup();
+  mtx_size_setup();
+  mtx_trace_setup();
+  mtx_transpose_setup();
+  mtx_zeros_setup();
+  mtx_tilde_setup();
+}
+
+void iemmatrix_setup(){
+  post("");
+  post("iemmatrix "VERSION);
+  post("\tobjects for manipulating 2d-matrices");
+  post("\t(c) IOhannes m zmölnig, Thomas Musil :: iem, 2001-2005");
+  post("\tcompiled "__DATE__" : "__TIME__);
+  post("");
+
+  iemtx_setup();
+}
diff --git a/src/iemmatrix.h b/src/iemmatrix.h
new file mode 100644
index 0000000..aeaec85
--- /dev/null
+++ b/src/iemmatrix.h
@@ -0,0 +1,95 @@
+/* ************************************* */
+/* iemmatrix                             */
+/* ************************************* */
+/*  objects for simple matrix operations */
+/* ************************************* */
+
+/* IEMMATRIX is a runtime-library for miller s. puckette's realtime-computermusic-software "pure data"
+ * therefore you NEED "pure data" to make any use of the IEMMATRIX external
+ * (except if you want to use the code for other things)
+ * download "pure data" at
+ *
+ * http://pd.iem.at
+ * ftp://iem.at/pd
+ *
+ * 
+ * IEMMATRIX is published under the Lesser GNU GeneralPublicLicense (LGPL),
+ * that must be shipped with IEMMATRIX.
+ * if you are using Debian GNU/linux, 
+ * the lesser GNU-GPL can be found under /usr/share/common-licenses/LGPL
+ * if you still haven't found a copy of the lesser GNU-GPL, have a look at http://www.gnu.org
+ *
+ * "pure data" has it's own license, that comes shipped with "pure data".
+ *
+ * there are ABSOLUTELY NO WARRANTIES for anything
+ */
+
+#ifndef INCLUDE_IEMMATRIX_H__
+#define INCLUDE_IEMMATRIX_H__
+
+#include "m_pd.h"
+
+#define VERSION "0.1"
+
+#ifdef NT
+# pragma warning( disable : 4244 )
+# pragma warning( disable : 4305 )
+#endif
+
+#include <math.h>
+#include <stdio.h>
+
+#include <string.h>
+#include <memory.h>
+
+#ifdef NT
+# define fabsf fabs
+#endif
+
+typedef long double t_matrixfloat;
+
+
+/* the main class...*/
+typedef struct _matrix
+{
+  t_object x_obj;
+
+  int      row;
+  int      col;
+
+  t_atom *atombuffer;
+
+  int     current_row, current_col;  /* this makes things easy for the mtx_row & mtx_col...*/
+  t_float f;
+
+  t_canvas *x_canvas;
+} t_matrix;
+
+void matrix_free(t_matrix*x);
+
+/* utility function */
+void setdimen(t_matrix *x, int row, int col);
+void adjustsize(t_matrix *x, int desiredRow, int desiredCol);
+void debugmtx(int argc, t_float *buf, int id);
+t_matrixfloat *matrix2float(t_atom *ap);
+void float2matrix(t_atom *ap, t_matrixfloat *buffer);
+
+/* basic I/O functions */
+void matrix_bang(t_matrix *x); /* output the matrix stored in atombuffer */
+void matrix_matrix2(t_matrix *x, t_symbol *s, int argc, t_atom *argv); /* store the matrix in atombuffer */
+
+/* set data */
+void matrix_set(t_matrix *x, t_float f); /* set the entire matrix to "f" */
+void matrix_zeros(t_matrix *x, t_symbol *s, int argc, t_atom *argv);
+void matrix_ones(t_matrix *x, t_symbol *s, int argc, t_atom *argv);
+void matrix_eye(t_matrix *x, t_symbol *s, int argc, t_atom *argv);
+void matrix_egg(t_matrix *x, t_symbol *s, int argc, t_atom *argv);
+void matrix_diag(t_matrix *x, t_symbol *s, int argc, t_atom *argv);
+void matrix_diegg(t_matrix *x, t_symbol *s, int argc, t_atom *argv);
+
+/* get/set data */
+void matrix_row(t_matrix *x, t_symbol *s, int argc, t_atom *argv);
+void matrix_col(t_matrix *x, t_symbol *s, int argc, t_atom *argv);
+void matrix_element(t_matrix *x, t_symbol *s, int argc, t_atom *argv);
+
+#endif
diff --git a/src/make.source b/src/make.source
new file mode 100644
index 0000000..dc22aae
--- /dev/null
+++ b/src/make.source
@@ -0,0 +1 @@
+SOURCES = \
diff --git a/src/mtx_binops.c b/src/mtx_binops.c
new file mode 100644
index 0000000..5625667
--- /dev/null
+++ b/src/mtx_binops.c
@@ -0,0 +1,680 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/*
+  mtx_add
+  mtx_+
+  mtx_mul
+  mtx_*
+  mtx_.*
+  mtx_./
+*/
+
+/* -­------------------------------------------------------------- */
+/* matrix math */
+
+typedef struct _mtx_binscalar
+{
+  t_object x_obj;
+
+  t_matrix m; // the output matrix
+  t_float f;  // the second input
+} t_mtx_binscalar;
+
+typedef struct _mtx_binmtx
+{
+  t_object x_obj;
+
+  t_matrix m;  // the output matrix
+  t_matrix m2; // the second input
+} t_mtx_binmtx;
+
+static void mtx_bin_matrix2(t_mtx_binmtx *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row = atom_getfloat(argv);
+  int col = atom_getfloat(argv+1);
+  if (argc<2){post("mtx_bin2: crippled matrix"); return;}
+  if ((col<1)||(row<1)) {post("mtx_bin2: invalid dimensions %dx%d", row,col); return;}
+  if (col*row+2>argc){ post("mtx_bin2: sparse matrix not yet supported : use \"mtx_check\""); return;}
+
+  if (row*col!=x->m2.row*x->m2.col) {
+    freebytes(x->m2.atombuffer, (x->m2.row*x->m2.col+2)*sizeof(t_atom));
+    x->m2.atombuffer=copybytes(argv,(row*col+2)*sizeof(t_atom));
+  }else memcpy(x->m2.atombuffer, argv, (row*col+2)*sizeof(t_atom));
+  setdimen(&x->m2, row, col);
+}
+
+static void mtx_binmtx_bang(t_mtx_binmtx *x)
+{
+  if((&x->m)&&(x->m.atombuffer))
+    outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), x->m.col*x->m.row+2, x->m.atombuffer);
+}
+
+
+static void mtx_binmtx_free(t_mtx_binmtx *x)
+{
+  matrix_free(&x->m);
+  matrix_free(&x->m2);
+}
+static void mtx_binscalar_bang(t_mtx_binscalar *x)
+{
+  if((&x->m)&&(x->m.atombuffer))
+    outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), x->m.col*x->m.row+2, x->m.atombuffer);
+}
+static void mtx_binscalar_free(t_mtx_binscalar *x)
+{
+  matrix_free(&x->m);
+}
+
+
+
+/* mtx_add */
+static t_class *mtx_add_class, *mtx_addscalar_class;
+
+static void mtx_addscalar_matrix(t_mtx_binscalar *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int n=argc-2;
+  int row=atom_getfloat(argv), col=atom_getfloat(argv+1);
+  
+  t_float offset=x->f;
+  t_atom *buf;
+  t_atom *ap=argv+2;
+
+  if(argc<2){post("mtx_add: crippled matrix");return; }
+  adjustsize(&x->m, row, col);
+
+  buf=x->m.atombuffer+2;
+
+  while(n--){
+    buf->a_type = A_FLOAT;
+    buf++->a_w.w_float = atom_getfloat(ap++) + offset;
+  }
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+}
+static void mtx_addscalar_list(t_mtx_binscalar *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int n=argc;
+  t_atom *m;
+  t_float offset = x->f;
+  adjustsize(&x->m, 1, argc);
+  m = x->m.atombuffer;
+
+  while(n--){
+    m->a_type = A_FLOAT;
+    (m++)->a_w.w_float = atom_getfloat(argv++) + offset;
+  }
+  outlet_list(x->x_obj.ob_outlet, gensym("list"), argc, x->m.atombuffer);
+}
+
+static void mtx_add_matrix(t_mtx_binmtx *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv);
+  int col=atom_getfloat(argv+1);
+  t_atom *m;
+  t_atom *m1 = argv+2;
+  t_atom *m2 = x->m2.atombuffer+2;
+  int n = argc-2;
+
+  if (argc<2){    post("mtx_add: crippled matrix");    return;  }
+  if ((col<1)||(row<1)) {    post("mtx_add: invalid dimensions");    return;  }
+  if (col*row>argc-2){    post("sparse matrix not yet supported : use \"mtx_check\"");    return;  }
+
+  if (!(x->m2.col*x->m2.row)) {
+    outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, argv);
+    return;
+  }
+
+  if ((col!=x->m2.col)||(row!=x->m2.row)){ 
+    post("mtx_add: matrix dimensions do not match");
+    /* LATER SOLVE THIS */    
+    return;
+  }
+  adjustsize(&x->m, row, col);
+  m = x->m.atombuffer+2;
+
+  while(n--){
+    t_float f = atom_getfloat(m1++)+atom_getfloat(m2++);
+    SETFLOAT(m, f);
+    m++;
+  }
+  
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+}
+static void mtx_add_float(t_mtx_binmtx *x, t_float f)
+{
+  t_matrix *m=&x->m, *m2=&x->m2;
+  t_atom *ap, *ap2=m2->atombuffer+2;
+  int row2, col2, n;
+
+  if (!m2->atombuffer){ post("mulitply with what ?");            return; }
+
+  row2=atom_getfloat(m2->atombuffer);
+  col2=atom_getfloat(m2->atombuffer+1);
+  adjustsize(m, row2, col2);
+  ap=m->atombuffer+2;
+
+  n=row2*col2;
+
+  while(n--){
+    SETFLOAT(ap, f+atom_getfloat(ap2++));
+    ap++;
+  }
+  
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), m->row*m->col+2, m->atombuffer);
+}
+static void *mtx_add_new(t_symbol *s, int argc, t_atom *argv)
+{
+  if (argc>1) post("mtx_add : extra arguments ignored");
+  if (argc) {
+    t_mtx_binscalar *x = (t_mtx_binscalar *)pd_new(mtx_addscalar_class);
+    floatinlet_new(&x->x_obj, &x->f);
+    x->f = atom_getfloatarg(0, argc, argv);
+    outlet_new(&x->x_obj, 0);
+    return(x);
+  } else {
+    t_mtx_binmtx *x = (t_mtx_binmtx *)pd_new(mtx_add_class);
+    inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("matrix"), gensym(""));
+    outlet_new(&x->x_obj, 0);
+    x->m.col = x->m.row =  x->m2.col = x->m2.row = 0;
+    x->m.atombuffer = x->m2.atombuffer = 0;
+    return(x);
+  }
+}
+
+static void mtx_add_setup(void)
+{
+  mtx_add_class = class_new(gensym("mtx_add"), (t_newmethod)mtx_add_new, (t_method)mtx_binmtx_free,
+			    sizeof(t_mtx_binmtx), 0, A_GIMME, 0);
+  class_addcreator((t_newmethod)mtx_add_new, gensym("mtx_+"), A_GIMME,0);
+  class_addmethod(mtx_add_class, (t_method)mtx_add_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addmethod(mtx_add_class, (t_method)mtx_bin_matrix2, gensym(""), A_GIMME, 0);
+  class_addfloat (mtx_add_class, mtx_add_float);
+  class_addbang  (mtx_add_class, mtx_binmtx_bang);
+
+  mtx_addscalar_class = class_new(gensym("mtx_add"), 0, (t_method)mtx_binscalar_free,
+				  sizeof(t_mtx_binscalar), 0, 0);
+  class_addcreator(0, gensym("mtx_+"), 0, 0);
+  class_addmethod(mtx_addscalar_class, (t_method)mtx_addscalar_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addlist  (mtx_addscalar_class, mtx_addscalar_list);
+  class_addbang  (mtx_addscalar_class, mtx_binscalar_bang);
+
+  class_sethelpsymbol(mtx_add_class, gensym("iemmatrix/mtx_binops"));
+  class_sethelpsymbol(mtx_addscalar_class, gensym("iemmatrix/mtx_binops"));
+}
+
+/* mtx_sub */
+static t_class *mtx_sub_class, *mtx_subscalar_class;
+
+static void mtx_subscalar_matrix(t_mtx_binscalar *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int n=argc-2;
+  int row=atom_getfloat(argv), col=atom_getfloat(argv+1);
+  
+  t_float offset=x->f;
+  t_atom *buf;
+  t_atom *ap=argv+2;
+
+  if(argc<2){post("mtx_sub: crippled matrix");return; }
+  adjustsize(&x->m, row, col);
+
+  buf=x->m.atombuffer+2;
+
+  while(n--){
+    buf->a_type = A_FLOAT;
+    buf++->a_w.w_float = atom_getfloat(ap++) - offset;
+  }
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+}
+static void mtx_subscalar_list(t_mtx_binscalar *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int n=argc;
+  t_atom *m;
+  t_float offset = x->f;
+  adjustsize(&x->m, 1, argc);
+  m = x->m.atombuffer;
+
+  while(n--){
+    m->a_type = A_FLOAT;
+    (m++)->a_w.w_float = atom_getfloat(argv++) - offset;
+  }
+  outlet_list(x->x_obj.ob_outlet, gensym("list"), argc, x->m.atombuffer);
+}
+
+static void mtx_sub_matrix(t_mtx_binmtx *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv);
+  int col=atom_getfloat(argv+1);
+  t_atom *m;
+  t_atom *m1 = argv+2;
+  t_atom *m2 = x->m2.atombuffer+2;
+  int n = argc-2;
+
+  if (argc<2){    post("mtx_sub: crippled matrix");    return;  }
+  if ((col<1)||(row<1)) {    post("mtx_sub: invalid dimensions");    return;  }
+  if (col*row>argc-2){    post("sparse matrix not yet supported : use \"mtx_check\"");    return;  }
+
+  if (!(x->m2.col*x->m2.row)) {
+    outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, argv);
+    return;
+  }
+
+  if ((col!=x->m2.col)||(row!=x->m2.row)){ 
+    post("mtx_sub: matrix dimensions do not match");
+    /* LATER SOLVE THIS */    
+    return;
+  }
+  adjustsize(&x->m, row, col);
+  m = x->m.atombuffer+2;
+
+  while(n--){
+    t_float f = atom_getfloat(m1++)-atom_getfloat(m2++);
+    SETFLOAT(m, f);
+    m++;
+  }
+  
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+}
+static void mtx_sub_float(t_mtx_binmtx *x, t_float f)
+{
+  t_matrix *m=&x->m, *m2=&x->m2;
+  t_atom *ap, *ap2=m2->atombuffer+2;
+  int row2, col2, n;
+
+  if (!m2->atombuffer){ post("mulitply with what ?");            return; }
+
+  row2=atom_getfloat(m2->atombuffer);
+  col2=atom_getfloat(m2->atombuffer+1);
+  adjustsize(m, row2, col2);
+  ap=m->atombuffer+2;
+
+  n=row2*col2;
+
+  while(n--){
+    SETFLOAT(ap, f-atom_getfloat(ap2++));
+    ap++;
+  }
+  
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), m->row*m->col+2, m->atombuffer);
+}
+static void *mtx_sub_new(t_symbol *s, int argc, t_atom *argv)
+{
+  if (argc>1) post("mtx_sub : extra arguments ignored");
+  if (argc) {
+    t_mtx_binscalar *x = (t_mtx_binscalar *)pd_new(mtx_subscalar_class);
+    floatinlet_new(&x->x_obj, &x->f);
+    x->f = atom_getfloatarg(0, argc, argv);
+    outlet_new(&x->x_obj, 0);
+    return(x);
+  } else {
+    t_mtx_binmtx *x = (t_mtx_binmtx *)pd_new(mtx_sub_class);
+    inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("matrix"), gensym(""));
+    outlet_new(&x->x_obj, 0);
+    x->m.col = x->m.row =  x->m2.col = x->m2.row = 0;
+    x->m.atombuffer = x->m2.atombuffer = 0;
+    return(x);
+  }
+}
+
+static void mtx_sub_setup(void)
+{
+  mtx_sub_class = class_new(gensym("mtx_sub"), (t_newmethod)mtx_sub_new, (t_method)mtx_binmtx_free,
+			    sizeof(t_mtx_binmtx), 0, A_GIMME, 0);
+  class_addcreator((t_newmethod)mtx_sub_new, gensym("mtx_-"), A_GIMME,0);
+  class_addmethod(mtx_sub_class, (t_method)mtx_sub_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addmethod(mtx_sub_class, (t_method)mtx_bin_matrix2, gensym(""), A_GIMME, 0);
+  class_addfloat (mtx_sub_class, mtx_sub_float);
+  class_addbang  (mtx_sub_class, mtx_binmtx_bang);
+
+  mtx_subscalar_class = class_new(gensym("mtx_sub"), 0, (t_method)mtx_binscalar_free,
+				  sizeof(t_mtx_binscalar), 0, 0);
+  class_addcreator(0, gensym("mtx_-"), 0, 0);
+  class_addmethod(mtx_subscalar_class, (t_method)mtx_subscalar_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addlist  (mtx_subscalar_class, mtx_subscalar_list);
+  class_addbang  (mtx_subscalar_class, mtx_binscalar_bang);
+
+  class_sethelpsymbol(mtx_sub_class, gensym("iemmatrix/mtx_binops"));
+  class_sethelpsymbol(mtx_subscalar_class, gensym("iemmatrix/mtx_binops"));
+}
+
+
+/* mtx_mul */
+static t_class *mtx_mul_class, *mtx_mulelement_class, *mtx_mulscalar_class;
+
+static void mtx_mul_matrix(t_mtx_binmtx *x, t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *m=&x->m, *m2=&x->m2;
+  t_atom *ap, *ap1=argv+2, *ap2=m2->atombuffer+2;
+  int row=atom_getfloat(argv), col=atom_getfloat(argv+1);
+  int row2, col2, n, r, c;
+
+  if (!m2->atombuffer){ post("mulitply with what ?");            return; }
+  if (argc<2){          post("mtx_mul: crippled matrix");        return; }
+  if ((col<1)||(row<1)){post("mtx_mul: invalid dimensions");     return; }
+  if (col*row>argc-2){  post("sparse matrix not yet supported : use \"mtx_check\""); return; }
+
+  row2=atom_getfloat(m2->atombuffer);
+  col2=atom_getfloat(m2->atombuffer+1);
+ 
+  if (col!=row2) {      post("mtx_mul: matrix dimensions do not match !"); return;  }
+
+  adjustsize(m, row, col2); 
+  ap=m->atombuffer+2;
+
+  for(r=0;r<row;r++)
+    for(c=0;c<col2;c++) {
+      t_matrixfloat sum = 0.f;
+      for(n=0;n<col;n++)sum+=(t_matrixfloat)atom_getfloat(ap1+col*r+n)*atom_getfloat(ap2+col2*n+c);
+      SETFLOAT(ap+col2*r+c,sum);
+    }
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), m->row*m->col+2, m->atombuffer);
+}
+
+static void mtx_mul_float(t_mtx_binmtx *x, t_float f)
+{
+  t_matrix *m=&x->m, *m2=&x->m2;
+  t_atom *ap, *ap2=m2->atombuffer+2;
+  int row2, col2, n;
+
+  if (!m2->atombuffer){ post("mulitply with what ?");            return; }
+
+  row2=atom_getfloat(m2->atombuffer);
+  col2=atom_getfloat(m2->atombuffer+1);
+  adjustsize(m, row2, col2);
+  ap=m->atombuffer+2;
+
+  n=row2*col2;
+
+  while(n--){
+    SETFLOAT(ap, f*atom_getfloat(ap2++));
+    ap++;
+  }
+  
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), m->row*m->col+2, m->atombuffer);
+}
+
+static void mtx_mulelement_matrix(t_mtx_binmtx *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+  t_atom *m;
+  t_atom *m2 = x->m2.atombuffer+2;
+  int n = argc-2;
+
+  if (argc<2){    post("mtx_mul: crippled matrix");    return;  }
+  if ((col<1)||(row<1)) {    post("mtx_mul: invalid dimensions");    return;  }
+  if (col*row>argc-2){    post("sparse matrix not yet supported : use \"mtx_check\"");    return;  }
+  if (!(x->m2.col*x->m2.row)) {
+    adjustsize(&x->m, row, col);
+    matrix_set(&x->m, 0);
+    outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+    return;
+  }
+  if ((col!=x->m2.col)||(row!=x->m2.row)){    post("matrix dimension do not match");    /* LATER SOLVE THIS */    return;  }
+
+  adjustsize(&x->m, row, col);
+  m =  x->m.atombuffer+2;
+
+  while(n--){
+    t_float f = atom_getfloat(argv++)*atom_getfloat(m2++);
+    SETFLOAT(m, f);
+    m++;
+  }
+
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+}
+
+static void mtx_mulscalar_matrix(t_mtx_binscalar *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int n=argc-2;
+  t_atom *m;
+  t_float factor = x->f;
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+
+  if (argc<2){
+    post("mtx_mul: crippled matrix");
+    return;
+  }
+  adjustsize(&x->m, row, col);
+  m = x->m.atombuffer+2;
+
+  while(n--){
+    m->a_type = A_FLOAT;
+    (m++)->a_w.w_float = atom_getfloat(argv++)*factor;
+  }
+
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+}
+static void mtx_mulscalar_list(t_mtx_binscalar *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int n=argc;
+  t_atom *m;
+  t_float factor = x->f;
+  adjustsize(&x->m, 1, argc);
+  m = x->m.atombuffer;
+
+  while(n--){
+    m->a_type = A_FLOAT;
+    (m++)->a_w.w_float = atom_getfloat(argv++)*factor;
+  }
+  outlet_list(x->x_obj.ob_outlet, gensym("list"), argc, x->m.atombuffer);
+}
+
+static void *mtx_mul_new(t_symbol *s, int argc, t_atom *argv)
+{
+  if (argc>1) post("mtx_mul : extra arguments ignored");
+  if (argc) {
+    t_mtx_binscalar *x = (t_mtx_binscalar *)pd_new(mtx_mulscalar_class);
+    floatinlet_new(&x->x_obj, &x->f);
+    x->f = atom_getfloatarg(0, argc, argv);
+    outlet_new(&x->x_obj, 0);
+    return(x);
+  } else {
+    if (s->s_name[4]=='.') {
+      /* element mul */
+
+      t_matrix *x = (t_matrix *)pd_new(mtx_mulelement_class);
+      inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("matrix"), gensym(""));
+      outlet_new(&x->x_obj, 0);
+      x->col = x->row = 0;
+      x->atombuffer = 0;
+      return(x);
+    } else {
+      t_mtx_binmtx *x = (t_mtx_binmtx *)pd_new(mtx_mul_class);
+      inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("matrix"), gensym(""));
+      outlet_new(&x->x_obj, 0);
+      x->m.col = x->m.row = x->m2.col = x->m2.row = 0;
+      x->m.atombuffer = x->m2.atombuffer = 0;
+      return (x);
+    }
+  }
+}
+
+static void mtx_mul_setup(void)
+{
+  mtx_mul_class = class_new(gensym("mtx_mul"), (t_newmethod)mtx_mul_new, (t_method)mtx_binmtx_free,
+			    sizeof(t_mtx_binmtx), 0, A_GIMME, 0);
+  class_addcreator((t_newmethod)mtx_mul_new, gensym("mtx_*"), A_GIMME,0);
+  class_addmethod(mtx_mul_class, (t_method)mtx_mul_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addmethod(mtx_mul_class, (t_method)mtx_bin_matrix2, gensym(""), A_GIMME, 0);
+  class_addfloat (mtx_mul_class, mtx_mul_float);
+  class_addbang  (mtx_mul_class, mtx_binmtx_bang);
+
+  mtx_mulelement_class = class_new(gensym("mtx_.*"), (t_newmethod)mtx_mul_new, (t_method)mtx_binmtx_free,
+				   sizeof(t_mtx_binmtx), 0, A_GIMME, 0);
+  class_addmethod(mtx_mulelement_class, (t_method)mtx_mulelement_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addmethod(mtx_mulelement_class, (t_method)mtx_bin_matrix2, gensym(""), A_GIMME, 0);
+  class_addfloat (mtx_mulelement_class, mtx_mul_float);
+  class_addbang  (mtx_mulelement_class, mtx_binmtx_bang);
+
+  mtx_mulscalar_class = class_new(gensym("mtx_mul"), 0, (t_method)mtx_binscalar_free,
+				  sizeof(t_mtx_binscalar), 0, 0);
+  class_addcreator(0, gensym("mtx_*"), 0, 0);
+  class_addcreator(0, gensym("mtx_.*"), 0, 0);
+  class_addmethod(mtx_mulscalar_class, (t_method)mtx_mulscalar_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addlist  (mtx_mulscalar_class, mtx_mulscalar_list);
+  class_addbang  (mtx_mulscalar_class, mtx_binscalar_bang);
+
+  class_sethelpsymbol(mtx_mul_class, gensym("iemmatrix/mtx_binops"));
+  class_sethelpsymbol(mtx_mulelement_class, gensym("iemmatrix/mtx_binops"));
+  class_sethelpsymbol(mtx_mulscalar_class, gensym("iemmatrix/mtx_binops"));
+}
+
+
+/* mtx_div */
+static t_class *mtx_divelement_class, *mtx_divscalar_class;
+
+static void mtx_divelement_matrix(t_mtx_binmtx *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+  t_atom *m;
+  t_atom *m2 = x->m2.atombuffer+2;
+  int n = argc-2;
+
+  if (argc<2){    post("mtx_div: crippled matrix");    return;  }
+  if ((col<1)||(row<1)) {    post("mtx_div: invalid dimensions");    return;  }
+  if (col*row>argc-2){    post("sparse matrix not yet supported : use \"mtx_check\"");    return;  }
+  if (!(x->m2.col*x->m2.row)) {
+    adjustsize(&x->m, row, col);
+    matrix_set(&x->m, 0);
+    outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+    return;
+  }
+  if ((col!=x->m2.col)||(row!=x->m2.row)){    post("matrix dimension do not match");    /* LATER SOLVE THIS */    return;  }
+
+  adjustsize(&x->m, row, col);
+  m =  x->m.atombuffer+2;
+
+  while(n--){
+    t_float f = atom_getfloat(argv++)/atom_getfloat(m2++);
+    SETFLOAT(m, f);
+    m++;
+  }
+
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+}
+static void mtx_divelement_float(t_mtx_binmtx *x, t_float f)
+{
+  t_matrix *m=&x->m, *m2=&x->m2;
+  t_atom *ap, *ap2=m2->atombuffer+2;
+  int row2, col2, n;
+
+  if (!m2->atombuffer){ post("divide by what ?");            return; }
+
+  row2=atom_getfloat(m2->atombuffer);
+  col2=atom_getfloat(m2->atombuffer+1);
+  adjustsize(m, row2, col2);
+  ap=m->atombuffer+2;
+
+  n=row2*col2;
+
+  while(n--){
+    SETFLOAT(ap, f/atom_getfloat(ap2++));
+    ap++;
+  }
+  
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), m->row*m->col+2, m->atombuffer);
+}
+static void mtx_divscalar_matrix(t_mtx_binscalar *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int n=argc-2;
+  t_atom *m;
+  t_float factor = 1.0/x->f;
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+
+  if (argc<2){
+    post("mtx_div: crippled matrix");
+    return;
+  }
+  adjustsize(&x->m, row, col);
+  m = x->m.atombuffer+2;
+
+  while(n--){
+    m->a_type = A_FLOAT;
+    (m++)->a_w.w_float = atom_getfloat(argv++)*factor;
+  }
+
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+}
+static void mtx_divscalar_list(t_mtx_binscalar *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int n=argc;
+  t_atom *m;
+  t_float factor = 1.0/x->f;
+
+  adjustsize(&x->m, 1, argc);
+  m = x->m.atombuffer;
+
+  while(n--){
+    m->a_type = A_FLOAT;
+    (m++)->a_w.w_float = atom_getfloat(argv++)*factor;
+  }
+
+  outlet_list(x->x_obj.ob_outlet, gensym("list"), argc, x->m.atombuffer);
+}
+
+static void *mtx_div_new(t_symbol *s, int argc, t_atom *argv)
+{
+  if (argc>1) post("mtx_div : extra arguments ignored");
+  if (argc) {
+    /* scalar division */
+    t_mtx_binscalar *x = (t_mtx_binscalar *)pd_new(mtx_divscalar_class);
+    floatinlet_new(&x->x_obj, &x->f);
+    x->f = atom_getfloatarg(0, argc, argv);
+    outlet_new(&x->x_obj, 0);
+    return(x);
+  } else {
+    /* element division */
+    t_matrix *x = (t_matrix *)pd_new(mtx_divelement_class);
+    inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("matrix"), gensym(""));
+    outlet_new(&x->x_obj, 0);
+    x->col = x->row = 0;
+    x->atombuffer = 0;
+    return(x);
+  }
+}
+
+static void mtx_div_setup(void)
+{
+  mtx_divelement_class = class_new(gensym("mtx_./"), (t_newmethod)mtx_div_new, (t_method)mtx_binmtx_free,
+				   sizeof(t_mtx_binmtx), 0, A_GIMME, 0);
+  class_addmethod(mtx_divelement_class, (t_method)mtx_divelement_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addmethod(mtx_divelement_class, (t_method)mtx_bin_matrix2, gensym(""), A_GIMME, 0);
+  class_addfloat (mtx_divelement_class, mtx_divelement_float);
+  class_addbang  (mtx_divelement_class, mtx_binmtx_bang);
+
+  mtx_divscalar_class = class_new(gensym("mtx_./"), 0, (t_method)mtx_binscalar_free,
+				  sizeof(t_mtx_binscalar), 0, 0);
+  class_addmethod(mtx_divscalar_class, (t_method)mtx_divscalar_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addlist  (mtx_divscalar_class, mtx_divscalar_list);
+  class_addbang  (mtx_divscalar_class, mtx_binscalar_bang);
+
+  class_sethelpsymbol(mtx_divelement_class, gensym("iemmatrix/mtx_binops"));
+  class_sethelpsymbol(mtx_divscalar_class, gensym("iemmatrix/mtx_binops"));
+}
+
+void mtx_binops_setup(void)
+{
+  mtx_add_setup();
+  mtx_sub_setup();
+  mtx_mul_setup();
+  mtx_div_setup();
+}
+void iemtx_binops_setup(void)
+{
+  mtx_binops_setup();
+}
diff --git a/src/mtx_check.c b/src/mtx_check.c
new file mode 100644
index 0000000..0e2eda1
--- /dev/null
+++ b/src/mtx_check.c
@@ -0,0 +1,76 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_check */
+static t_class *mtx_check_class;
+
+static void mtx_check_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv);
+  int col=atom_getfloat(argv+1);
+  t_atom *ap;
+  int length=row*col, n;
+  argc-=2;
+
+  if(length>argc) {
+    /* sparse matrix */
+    adjustsize(x, row, col);
+    matrix_set(x, 0);
+    argv+=2;
+    ap=x->atombuffer+2;
+    n=argc;
+    while(n--){
+      t_float f = atom_getfloat(argv++);
+      SETFLOAT(ap, f);
+      ap++;
+    }    
+    matrix_bang(x);
+  } else {
+    SETFLOAT(argv, row);
+    SETFLOAT(argv+1, col);
+    ap=argv+2;
+    n=length;
+    while(n--){
+      t_float f = atom_getfloat(ap);
+      SETFLOAT(ap, f);
+      ap++;
+    }
+    outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), length+2, argv);
+  }
+}
+
+static void *mtx_check_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_check_class);
+  outlet_new(&x->x_obj, 0);
+  x->col=x->row=0;
+  x->atombuffer=0;
+  return (x);
+}
+
+void mtx_check_setup(void)
+{
+  mtx_check_class = class_new(gensym("mtx_check"), (t_newmethod)mtx_check_new, 
+			      (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addbang  (mtx_check_class, matrix_bang);
+  class_addmethod(mtx_check_class, (t_method)mtx_check_matrix, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_check_class, gensym("iemmatrix/matrix"));
+}
+
+
+void iemtx_check_setup(void)
+{
+  mtx_check_setup();
+}
diff --git a/src/mtx_col.c b/src/mtx_col.c
new file mode 100644
index 0000000..1ee3dbb
--- /dev/null
+++ b/src/mtx_col.c
@@ -0,0 +1,129 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_col */
+static t_class *mtx_col_class;
+
+static void mtx_col_float(t_matrix *x, t_floatarg f)
+{
+  int i = f;
+  if(i<0)i=0;
+  x->current_col = i;
+}
+static void mtx_col_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row, col;
+  if (argc<2){    post("matrix : corrupt matrix passed");    return;  }
+  row = atom_getfloat(argv);
+  col = atom_getfloat(argv+1);
+  if ((row<1)||(col<1)){    post("matrix : corrupt matrix passed");    return;  }
+  if (row*col > argc-2){    post("matrix: sparse matrices not yet supported : use \"mtx_check\"");    return;  }
+  matrix_matrix2(x, s, argc, argv);
+  matrix_bang(x);
+}
+static void mtx_col_list(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  if (argc==1){
+    t_float f=atom_getfloat(argv);
+    t_atom *ap=x->atombuffer+1+x->current_col;
+    if (x->current_col>x->col){
+      post("mtx_col : too high a column is to be set");
+      return;
+    }
+    if (x->current_col){
+      int n=x->row;
+      while(n--){
+	SETFLOAT(ap, f);
+	ap+=x->row+1;
+      }
+    }
+    matrix_bang(x);
+    return;
+  }
+
+  if (argc<x->row){
+    post("mtx_col : column length is too small for %dx%d-matrix", x->row, x->col);
+    return;
+  }
+  if (x->current_col>x->col){
+    post("mtx_col : too high a column is to be set");
+    return;
+  }
+  if(x->current_col) {
+    int r=x->row;
+    t_atom *ap=x->atombuffer+1+x->current_col;
+    while(r--)SETFLOAT(&ap[(x->row-r-1)*x->col], atom_getfloat(argv++));
+  }  else {
+    int r=x->row;
+    t_atom *ap=x->atombuffer+2;
+    while (r--) {
+      t_float f=atom_getfloat(argv++);
+      int c=x->col;
+      while(c--){
+	SETFLOAT(ap, f);
+	ap++;
+      }
+    }
+  }
+  matrix_bang(x);
+}
+static void *mtx_col_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_col_class);
+  int i, j, q;
+  outlet_new(&x->x_obj, 0);
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym(""));
+  x->current_col=0;
+  x->col=x->row=0;
+  x->atombuffer=0;
+  switch (argc) {
+  case 0:break;
+  case 1:
+    i = atom_getfloat(argv);
+    if (i<0)i=0;
+    if(i)adjustsize(x, i, i);
+    matrix_set(x, 0);
+    break;
+  case 2:
+    i = atom_getfloat(argv++);if(i<0)i=0;
+    j = atom_getfloat(argv++);if(j<0)j=0;
+    if(i*j)adjustsize(x, i, j);
+    matrix_set(x, 0);
+    break;
+  default:
+    i = atom_getfloat(argv++);if(i<0)i=0;
+    j = atom_getfloat(argv++);if(j<0)j=0;
+    q = atom_getfloat(argv++);if(q<0)q=0;
+    if(i*j)adjustsize(x, i, j);
+    matrix_set(x, 0);
+    x->current_col=q;
+  }
+  return (x);
+}
+void mtx_col_setup(void)
+{
+  mtx_col_class = class_new(gensym("mtx_col"), (t_newmethod)mtx_col_new, 
+			    (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addbang  (mtx_col_class, matrix_bang);
+  class_addlist  (mtx_col_class, mtx_col_list);
+  class_addmethod(mtx_col_class, (t_method)mtx_col_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addmethod(mtx_col_class, (t_method)mtx_col_float, gensym(""), A_FLOAT, 0);
+  class_sethelpsymbol(mtx_col_class, gensym("iemmatrix/mtx_element"));
+}
+
+void iemmtx_col_setup(void)
+{
+  mtx_col_setup();
+}
diff --git a/src/mtx_diag.c b/src/mtx_diag.c
new file mode 100644
index 0000000..65acff2
--- /dev/null
+++ b/src/mtx_diag.c
@@ -0,0 +1,59 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_diag */
+static t_class *mtx_diag_class;
+static void mtx_diag_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+  int length=(col<row)?col:row, n=length;
+  t_atom *ap = (t_atom *)getbytes(length * sizeof(t_atom)), *dummy=ap;
+  if(row*col>argc-2)post("mtx_diag: sparse matrices not yet supported : use \"mtx_check\"");
+  else {
+    for(n=0;n<length;n++, dummy++)SETFLOAT(dummy, atom_getfloat(argv+n*(col+1)));
+    outlet_list(x->x_obj.ob_outlet, gensym("diag"), length, ap);
+  }
+  freebytes(ap, (length * sizeof(t_atom)));
+}
+
+static void *mtx_diag_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_diag_class);
+  outlet_new(&x->x_obj, 0);
+  x->row = x->col = 0;
+  x->atombuffer   = 0;
+
+  if(!argc)return(x);
+  x->atombuffer = (t_atom *)getbytes((argc*argc+2)*sizeof(t_atom));
+  setdimen(x, argc, argc);
+  matrix_set(x, 0);
+  argv+=argc-1;
+  while(argc--)SETFLOAT(x->atombuffer+2+argc*(1+x->col), atom_getfloat(argv--));
+
+  return (x);
+}
+void mtx_diag_setup(void)
+{
+  mtx_diag_class = class_new(gensym("mtx_diag"), (t_newmethod)mtx_diag_new, 
+			     (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addlist  (mtx_diag_class, matrix_diag);
+  class_addbang  (mtx_diag_class, matrix_bang);
+  class_addmethod(mtx_diag_class, (t_method)mtx_diag_matrix, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_diag_class, gensym("iemmatrix/mtx_trace"));
+}
+void iemtx_diag_setup(void){
+  void mtx_diag_setup(void);
+}
diff --git a/src/mtx_diegg.c b/src/mtx_diegg.c
new file mode 100644
index 0000000..658471f
--- /dev/null
+++ b/src/mtx_diegg.c
@@ -0,0 +1,56 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+static t_class *mtx_diegg_class;
+static void mtx_diegg_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+  int length=(col<row)?col:row, n=length;
+  t_atom *ap = (t_atom *)getbytes(length * sizeof(t_atom)), *dummy=ap;
+  if(row*col>argc-2)post("mtx_diegg: sparse matrices not yet supported : use \"mtx_check\"");
+  else {
+    for(n=0;n<length;n++, dummy++)SETFLOAT(dummy, atom_getfloat(argv+(n-1)*(col-1)));
+    outlet_list(x->x_obj.ob_outlet, gensym("diegg"), length, ap);
+  }
+  freebytes(ap, (length * sizeof(t_atom)));
+}
+static void *mtx_diegg_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_diegg_class);
+  outlet_new(&x->x_obj, 0);
+  x->row = x->col = 0;
+  x->atombuffer   = 0;
+
+  if(!argc)return(x);
+  x->atombuffer = (t_atom *)getbytes((argc*argc+2)*sizeof(t_atom));
+  setdimen(x, argc, argc);
+  matrix_set(x, 0);
+  argv+=argc-1;
+  while(argc--)SETFLOAT(x->atombuffer+2+argc*(1+x->col), atom_getfloat(argv--));
+
+  return (x);
+}
+void mtx_diegg_setup(void)
+{
+  mtx_diegg_class = class_new(gensym("mtx_diegg"), (t_newmethod)mtx_diegg_new, 
+			     (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addlist  (mtx_diegg_class, matrix_diegg);
+  class_addbang  (mtx_diegg_class, matrix_bang);
+  class_addmethod(mtx_diegg_class, (t_method)mtx_diegg_matrix, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_diegg_class, gensym("iemmatrix/mtx_special"));
+}
+void iemtx_diegg_setup(void){
+  mtx_diegg_setup();
+}
diff --git a/src/mtx_egg.c b/src/mtx_egg.c
new file mode 100644
index 0000000..a44894c
--- /dev/null
+++ b/src/mtx_egg.c
@@ -0,0 +1,58 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_egg */
+static t_class *mtx_egg_class;
+static void *mtx_egg_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_egg_class);
+  int col=0, row=0;
+  outlet_new(&x->x_obj, 0);
+  x->row = x->col = 0;
+  x->atombuffer   = 0;
+  switch(argc) {
+  case 0:
+    break;
+  case 1:
+    col=row=atom_getfloat(argv);
+    break;
+  default:
+    row=atom_getfloat(argv++);
+    col=atom_getfloat(argv);
+  }
+  if(col<0)col=0;
+  if(row<0)row=0;
+  if (col*row){
+    int n = (col<row)?col:row;
+    x->atombuffer = (t_atom *)getbytes((col*row+2)*sizeof(t_atom));
+    setdimen(x, row, col);
+    matrix_set(x, 0);
+    while(n--)SETFLOAT(x->atombuffer+2+(n+1)*(col-1), 1);
+  }
+  return (x);
+}
+void mtx_egg_setup(void)
+{
+  mtx_egg_class = class_new(gensym("mtx_egg"), (t_newmethod)mtx_egg_new, 
+			    (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addlist(mtx_egg_class, matrix_egg);
+  class_addbang(mtx_egg_class, matrix_bang);
+  class_addmethod(mtx_egg_class, (t_method)matrix_egg, gensym("matrix"), A_GIMME, 0);
+
+  class_sethelpsymbol(mtx_egg_class, gensym("iemmatrix/mtx_special"));
+}
+void iemtx_egg_setup(void){
+  mtx_egg_setup();
+}
diff --git a/src/mtx_element.c b/src/mtx_element.c
new file mode 100644
index 0000000..10d9664
--- /dev/null
+++ b/src/mtx_element.c
@@ -0,0 +1,118 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+
+/* mtx_element */
+static t_class *mtx_element_class;
+
+static void mtx_element_list2(t_matrix *x, t_floatarg f1, t_floatarg f2)
+{
+  int r = f1, c= f2;
+  if(r<0)r=0;
+  if(c<0)c=0;
+  x->current_row = r;
+  x->current_col = c;
+}
+static void mtx_element_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row, col;
+  if (argc<2){    post("matrix : corrupt matrix passed");    return;  }
+  row = atom_getfloat(argv);
+  col = atom_getfloat(argv+1);
+  if ((row<1)||(col<1)){    post("matrix : corrupt matrix passed");    return;  }
+  if (row*col > argc-2){    post("matrix: sparse matrices not yet supported : use \"mtx_check\"");    return;  }
+  matrix_matrix2(x, s, argc, argv);
+  matrix_bang(x);
+}
+static void mtx_element_float(t_matrix *x, t_floatarg f)
+{
+  if(x->current_col>x->col || x->current_row>x->row){
+    error("mtx_element: element position exceeds matrix dimensions");
+    return;
+  }
+  if(x->current_row == 0 && x->current_col == 0){
+    matrix_set(x, f);
+    matrix_bang(x);
+    return;
+  }
+  if(x->current_row*x->current_col)SETFLOAT(x->atombuffer+1+(x->current_row-1)*x->col+x->current_col, f);
+  else {
+    t_atom *ap=x->atombuffer+2;
+    int count;
+    if (!x->current_col){
+      ap+=x->col*(x->current_row-1);
+      count=x->col;
+      while(count--)SETFLOAT(&ap[count], f);
+    } else { // x->current_row==0
+      ap+=x->current_col-1;
+      count=x->row;
+      while(count--)SETFLOAT(&ap[count*x->col], f);
+    }
+  }
+  matrix_bang(x);
+}
+
+static void *mtx_element_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_element_class);
+  int i, j, q;
+  outlet_new(&x->x_obj, 0);
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym(""));
+  x->current_row=x->current_col=0;
+  x->col=x->row=0;
+  x->atombuffer=0;
+  switch (argc) {
+  case 1:
+    i = atom_getfloat(argv);
+    if (i<0)i=0;
+    if(i)adjustsize(x, i, i);
+    matrix_set(x, 0);
+    break;
+  case 2:
+    i = atom_getfloat(argv++);if(i<0)i=0;
+    j = atom_getfloat(argv++);if(j<0)j=0;
+    if(i*j)adjustsize(x, i, j);
+    matrix_set(x, 0);
+    break;
+  case 4:
+    i = atom_getfloat(argv++);if(i<0)i=0;
+    j = atom_getfloat(argv++);if(j<0)j=0;
+    if(i*j)adjustsize(x, i, j);
+    matrix_set(x, 0);
+    q = atom_getfloat(argv++);if(q<0)q=0;
+    x->current_row=q;
+    q = atom_getfloat(argv++);if(q<0)q=0;
+    x->current_col=q;
+    break;
+  default:;
+  }
+  return (x);
+}
+void mtx_element_setup(void)
+{
+  mtx_element_class = class_new(gensym("mtx_element"), (t_newmethod)mtx_element_new, 
+				(t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addbang  (mtx_element_class, matrix_bang);
+  class_addfloat (mtx_element_class, mtx_element_float);
+  class_addmethod(mtx_element_class, (t_method)mtx_element_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addmethod(mtx_element_class, (t_method)mtx_element_list2, gensym(""), A_FLOAT, A_FLOAT, 0);
+  class_sethelpsymbol(mtx_element_class, gensym("iemmatrix/mtx_element"));
+}
+
+
+void iemmtx_element_setup(void)
+{
+  mtx_element_setup();
+}
diff --git a/src/mtx_eye.c b/src/mtx_eye.c
new file mode 100644
index 0000000..e416ac4
--- /dev/null
+++ b/src/mtx_eye.c
@@ -0,0 +1,60 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* ------------------------------------------------------------------------------------- */
+
+/* mtx_eye */
+static t_class *mtx_eye_class;
+static void *mtx_eye_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_eye_class);
+  int col=0, row=0;
+  outlet_new(&x->x_obj, 0);
+  x->row = x->col = 0;
+  x->atombuffer   = 0;
+  switch(argc) {
+  case 0:
+    break;
+  case 1:
+    col=row=atom_getfloat(argv);
+    break;
+  default:
+    row=atom_getfloat(argv++);
+    col=atom_getfloat(argv);
+  }
+  if(col<0)col=0;
+  if(row<0)row=0;
+  if (col*row){
+    int n = (col<row)?col:row;
+    x->atombuffer = (t_atom *)getbytes((col*row+2)*sizeof(t_atom));
+    setdimen(x, row, col);
+    matrix_set(x, 0);
+    while(n--)SETFLOAT(x->atombuffer+2+n*(1+col), 1);
+  }
+  return (x);
+}
+void mtx_eye_setup(void)
+{
+  mtx_eye_class = class_new(gensym("mtx_eye"), (t_newmethod)mtx_eye_new, 
+			    (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addlist(mtx_eye_class, matrix_eye);
+  class_addbang(mtx_eye_class, matrix_bang);
+  class_addmethod(mtx_eye_class, (t_method)matrix_eye, gensym("matrix"), A_GIMME, 0);
+
+  class_sethelpsymbol(mtx_eye_class, gensym("iemmatrix/mtx_special"));
+}
+void iemtx_eye_setup(void){
+  mtx_eye_setup();
+}
diff --git a/src/mtx_inverse.c b/src/mtx_inverse.c
new file mode 100644
index 0000000..400f734
--- /dev/null
+++ b/src/mtx_inverse.c
@@ -0,0 +1,118 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_inverse */
+static t_class *mtx_inverse_class;
+
+static void mtx_inverse_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  /* maybe we should do this in double or long double ? */
+  int row=atom_getfloat(argv);
+  int col=atom_getfloat(argv+1);
+  int i, k, row2=row*row;
+
+  t_matrixfloat *original, *inverted;
+  t_matrixfloat *a1, *a2, *b1, *b2;  // dummy pointers
+
+  int ok = 0;
+
+  if(row*col+2>argc){
+    post("mtx_print : sparse matrices not yet supported : use \"mtx_check\"");
+    return;
+  }
+  if (row!=col){
+    post("mtx_inverse: only square matrices can be inverted");
+    return;
+  }
+
+  // reserve memory for outputting afterwards
+  adjustsize(x, row, row);
+  // 1. get the 2 matrices : orig; invert (create as eye, but will be orig^(-1))
+  inverted = (t_matrixfloat *)getbytes(sizeof(t_matrixfloat)*row2);
+  // 1a extract values of A to float-buf
+  original=matrix2float(argv);
+  // 1b make an eye-shaped float-buf for B
+  i=row2;
+  b1=inverted;
+  while(i--)*b1++=0;
+  i=row;
+  b1=inverted;
+  while(i--)b1[i*(row+1)]=1;
+
+  // 2. do the Gauss-Jordan
+  for (k=0;k<row;k++) {
+    // 2. adjust current row
+    t_matrixfloat diagel = original[k*(col+1)];
+    t_matrixfloat i_diagel = diagel?1./diagel:0;
+    if (!diagel)ok++;
+
+
+    /* normalize current row (set the diagonal-element to 1 */
+    a2=original+k*col;
+    b2=inverted+k*col;
+    i=row;
+    while(i--){
+      *a2++*=i_diagel;
+      *b2++*=i_diagel;
+    }
+    /* eliminate the k-th element in each row by adding the weighted normalized row */
+
+    a2=original+k*row;
+    b2=inverted+k*row;
+    for(i=0;i<row;i++)
+      if (i-k) {
+	t_matrixfloat f=-*(original+i*row+k);
+	int j = row;
+	a1=original+i*row;
+	b1=inverted+i*row;
+	while (j--) {
+	  *(a1+j)+=f**(a2+j);
+	  *(b1+j)+=f**(b2+j);
+	}
+      }
+  }
+  // 3. output the matrix
+  // 3a convert the floatbuf to an atombuf;
+  float2matrix(x->atombuffer, inverted);
+  // 3b destroy the buffers
+  freebytes(original, sizeof(t_matrixfloat)*row2);
+
+  if (ok)post("mtx_inverse: couldn't really invert the matrix !!! %d error%c", ok, (ok-1)?'s':0);
+
+  // 3c output the atombuf;
+  matrix_bang(x);
+}
+
+static void *mtx_inverse_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_inverse_class);
+  outlet_new(&x->x_obj, 0);
+  x->col=x->row=0;
+  x->atombuffer=0;
+
+  return (x);
+}
+void mtx_inverse_setup(void)
+{
+  mtx_inverse_class = class_new(gensym("mtx_inverse"), (t_newmethod)mtx_inverse_new, 
+				(t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addbang  (mtx_inverse_class, matrix_bang);
+  class_addmethod(mtx_inverse_class, (t_method)mtx_inverse_matrix, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_inverse_class, gensym("iemmatrix/mtx_inverse"));
+}
+
+void iemtx_inverse_setup(void){
+  mtx_inverse_setup();
+}
diff --git a/src/mtx_matrix.c b/src/mtx_matrix.c
new file mode 100644
index 0000000..98df0d2
--- /dev/null
+++ b/src/mtx_matrix.c
@@ -0,0 +1,606 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+
+/*
+  matrix : basic object : create and store matrices
+  mtx    : alias for matrix
+*/
+
+#include "iemmatrix.h"
+
+/* -------------------- matrix ------------------------------ */
+
+static t_class *matrix_class;
+
+/* intern utility functions */
+
+void setdimen(t_matrix *x, int row, int col)
+{
+  x->col = col;
+  x->row = row;
+  SETFLOAT(x->atombuffer,   row);
+  SETFLOAT(x->atombuffer+1, col);
+}
+
+void adjustsize(t_matrix *x, int desiredRow, int desiredCol)
+{
+  int col=x->col, row=x->row;
+
+  if (desiredRow<1){
+    post("cannot make less than 1 rows");
+    desiredRow=1;
+  }
+  if (desiredCol<1){
+    post("cannot make less than 1 columns");
+    desiredCol=1;
+  }
+
+  if (col*row!=desiredRow*desiredCol){
+    if(x->atombuffer)freebytes(x->atombuffer, (col*row+2)*sizeof(t_atom));
+    x->atombuffer=(t_atom *)getbytes((desiredCol*desiredRow+2)*sizeof(t_atom));
+  }
+
+  setdimen(x, desiredRow, desiredCol);
+  return;
+}
+
+void debugmtx(int argc, t_float *buf, int id)
+{
+  int i=argc;
+  while(i--){
+	  int j=argc;
+	  startpost("debug%d: ", id);
+	  while(j--)
+		  startpost("%f  ", *buf++);
+	  endpost();
+  }
+}
+t_matrixfloat *matrix2float(t_atom *ap)
+{
+  int row = atom_getfloat(ap++);
+  int col=atom_getfloat(ap++);
+  int length   = row * col;
+  t_matrixfloat *buffer = (t_matrixfloat *)getbytes(sizeof(t_matrixfloat)*length);
+  t_matrixfloat *buf = buffer;
+  while(length--)*buf++=atom_getfloat(ap++);
+  return buffer;
+}
+void float2matrix(t_atom *ap, t_matrixfloat *buffer)
+{
+  int row=atom_getfloat(ap++);
+  int col=atom_getfloat(ap++);
+  int length = row * col;
+  t_matrixfloat*buf= buffer;
+  while(length--){
+    SETFLOAT(ap, *buf++);
+    ap++;
+  }
+  freebytes(buffer, row*col*sizeof(t_matrixfloat));
+}
+
+/* core functions */
+void matrix_bang(t_matrix *x)
+{
+  /* output the matrix */
+  if (x->atombuffer)outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), x->col*x->row+2, x->atombuffer);
+}
+
+void matrix_matrix2(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row, col;
+
+  if (argc<2){
+    post("matrix : corrupt matrix passed");
+    return;
+  }
+  row = atom_getfloat(argv);
+  col = atom_getfloat(argv+1);
+  if ((row<1)||(col<1)){
+    post("matrix : corrupt matrix passed");
+    return;
+  }
+  if (row*col > argc-2){
+    post("matrix: sparse matrices not yet supported : use \"mtx_check\"");
+    return;
+  }
+
+  /* this is fast and dirty, MAYBE make it slow and clean */
+  /* or, to clean matrices, use the mtx_check object */
+  if (row*col != x->row*x->col) {
+    freebytes(x->atombuffer, x->row*x->col*sizeof(t_atom));
+    x->atombuffer = copybytes(argv, (row*col+2)*sizeof(t_atom));
+  } else memcpy(x->atombuffer, argv, (row*col+2)*sizeof(t_atom));
+
+  setdimen(x, row, col);
+}
+
+static void matrix_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row, col;
+
+  if (argc<2){
+    post("matrix : corrupt matrix passed");
+    return;
+  }
+  row = atom_getfloat(argv);
+  col = atom_getfloat(argv+1);
+  if ((row<1)||(col<1)){
+    post("matrix : corrupt matrix passed");
+    return;
+  }
+  if (row*col > argc-2){
+    post("matrix: sparse matrices not yet supported : use \"mtx_check\"");
+    return;
+  }
+
+  matrix_matrix2(x, s, argc, argv);
+  matrix_bang(x);
+}
+
+
+/* basic functions */
+
+void matrix_set(t_matrix *x, t_float f)
+{
+  int size = x->col * x->row;
+  t_atom *buf=x->atombuffer+2;
+  if(x->atombuffer)while(size--)SETFLOAT(&buf[size], f);
+}
+
+void matrix_zeros(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int col, row;
+
+  switch(argc) {
+  case 0: /* zero out the actual matrix */
+    matrix_set(x, 0);
+    break;
+  case 1:
+    row=atom_getfloat(argv);
+    adjustsize(x, row, row);
+    matrix_set(x, 0);
+    break;
+  default:
+    row=atom_getfloat(argv++);
+    col=atom_getfloat(argv);
+    adjustsize(x, row, col);
+
+    matrix_set(x, 0);
+  }
+
+  matrix_bang(x);
+}
+
+void matrix_ones(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int col, row;
+
+  switch(argc) {
+  case 0: /* zero out the actual matrix */
+    matrix_set(x, 1);
+    break;
+  case 1:
+    row=atom_getfloat(argv);
+    adjustsize(x, row, row);
+    matrix_set(x, 1);
+    break;
+  default:
+    row=atom_getfloat(argv++);
+    col=atom_getfloat(argv);
+    adjustsize(x, row, col);
+
+    matrix_set(x, 1);
+  }
+
+  matrix_bang(x);
+}
+
+void matrix_eye(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int col, row;
+  int n;
+
+  switch(argc) {
+  case 0: /* zero out the actual matrix */
+    matrix_set(x, 0);
+    break;
+  case 1:
+    row=atom_getfloat(argv);
+    adjustsize(x, row, row);
+    matrix_set(x, 0);
+    break;
+  default:
+    row=atom_getfloat(argv++);
+    col=atom_getfloat(argv);
+    adjustsize(x, row, col);
+    matrix_set(x, 0);
+  }
+
+  col=x->col;
+  row=x->row;
+  n = (col<row)?col:row;
+  while(n--)SETFLOAT(x->atombuffer+2+n*(1+col), 1);
+  
+  matrix_bang(x);
+}
+void matrix_egg(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int col, row;
+  int n;
+
+  switch(argc) {
+  case 0: /* zero out the actual matrix */
+    matrix_set(x, 0);
+    break;
+  case 1:
+    row=atom_getfloat(argv);
+    adjustsize(x, row, row);
+    matrix_set(x, 0);
+    break;
+  default:
+    row=atom_getfloat(argv++);
+    col=atom_getfloat(argv);
+    adjustsize(x, row, col);
+    matrix_set(x, 0);
+  }
+
+  col=x->col;
+  row=x->row;
+  n = (col<row)?col:row;
+  while(n--)SETFLOAT(x->atombuffer+2+(n+1)*(col-1), 1);
+  
+  matrix_bang(x);
+}
+
+void matrix_diag(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int col=argc;
+  argv+=argc-1;
+  if (argc<1) {
+    post("matrix: no diagonale present");
+    return;
+  }
+  adjustsize(x, argc, argc);
+  matrix_set(x, 0);
+
+  while(argc--)SETFLOAT(x->atombuffer+2+argc*(1+col), atom_getfloat(argv--));
+
+  matrix_bang(x);
+}
+void matrix_diegg(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int col=argc;
+  argv+=argc-1;
+  if (argc<1) {
+    post("matrix: no dieggonale present");
+    return;
+  }
+  adjustsize(x, argc, argc);
+  matrix_set(x, 0);
+
+  while(argc--){
+	  t_atom *ap=x->atombuffer+2+(argc+1)*(col-1);
+	  SETFLOAT(ap, atom_getfloat(argv--));
+  }
+
+  matrix_bang(x);
+}
+/* the rest */
+
+void matrix_row(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  t_atom *ap;
+  int row=x->row, col=x->col;
+  int r;
+  t_float f;
+
+  switch (argc){
+  case 0:
+    for (r=0;r<row;r++)outlet_list(x->x_obj.ob_outlet, gensym("row"), col, x->atombuffer+r*col+2);
+    break;
+  case 1:
+    r=atom_getfloat(argv)-1;
+    if ((r<0)||(r>=row)){
+      post("matrix: row index %d is out of range", r+1);
+      return;
+    }
+    outlet_list(x->x_obj.ob_outlet, gensym("row"), col, x->atombuffer+r*col+2);
+    break;
+  case 2:
+    r=atom_getfloat(argv)-1;
+    f=atom_getfloat(argv+1);
+    if ((r<0)||(r>=row)){
+      post("matrix: row index %d is out of range", r+1);
+      return;
+    }
+    
+    
+  default:
+    r=atom_getfloat(argv++)-1;
+    if (argc--<col){
+      post("matrix: sparse rows not yet supported : use \"mtx_check\"");
+      return;
+    }
+    if ((r<0)||(r>=row)){
+      post("matrix: row index %d is out of range", r+1);
+      return;
+    }
+    if (r==row) {
+    } else {
+      ap=x->atombuffer+2+col*r;
+      memcpy(ap, argv, col*sizeof(t_atom));
+    }
+  }
+}
+
+void matrix_col(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  t_atom *ap;
+  int row=x->row, col=x->col;
+  int c, r;
+
+  switch (argc){
+  case 0:
+    ap=(t_atom *)getbytes(row*sizeof(t_atom));
+    for (c=0;c<col;c++) {
+      for (r=0;r<row;r++)SETFLOAT(&ap[r], atom_getfloat(x->atombuffer+2+c+col*r));
+      outlet_list(x->x_obj.ob_outlet, gensym("col"), row, ap);
+    }
+    freebytes(ap, row*sizeof(t_atom));
+    break;
+  case 1:
+    ap=(t_atom *)getbytes(row*sizeof(t_atom));
+    c=atom_getfloat(argv)-1;
+    if ((c<0)||(c>=col)){
+      post("matrix: col index %d is out of range", c+1);
+      return;
+    }
+    for (r=0;r<row;r++)SETFLOAT(&ap[r], atom_getfloat(x->atombuffer+2+c+col*r));
+    outlet_list(x->x_obj.ob_outlet, gensym("col"), row, ap);
+    freebytes(ap, row*sizeof(t_atom));
+    break;
+  default:
+    c=atom_getfloat(argv++)-1;
+    if (argc--<row){
+      post("matrix: sparse cols not yet supported : use \"mtx_check\"");
+      return;
+    }
+    if ((c<0)||(c>=col)){
+      post("matrix: col index %d is out of range", c+1);
+      return;
+    }
+    argv+=argc-1;
+    if (argc>row)argc=row;
+    while(argc--){
+      ap=x->atombuffer+2+c+col*argc;
+      SETFLOAT(ap, atom_getfloat(argv--));
+    }
+  }
+}
+
+void matrix_element(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  t_atom *ap=x->atombuffer+2;
+  int row=x->row, col=x->col;
+  int r, c, i=row*col;
+
+  switch (argc){
+  case 0:
+    while(i--)outlet_float(x->x_obj.ob_outlet, atom_getfloat(ap++));
+    break;
+  case 1:
+    r=c=atom_getfloat(argv)-1;
+    if ((r<0)||(r>=row)){
+      post("matrix: row index %d is out of range", r+1);
+      return;
+    }
+    if ((c<0)||(c>=col)){
+      post("matrix: col index %d is out of range", c+1);
+      return;
+    }
+    outlet_float(x->x_obj.ob_outlet, atom_getfloat(x->atombuffer+2+c+r*col));
+    break;
+  case 2:
+    r=atom_getfloat(argv++)-1;
+    c=atom_getfloat(argv++)-1;
+    if ((r<0)||(r>=row)){      post("matrix: row index %d is out of range", r+1);      return;    }
+    if ((c<0)||(c>=col)){      post("matrix: col index %d is out of range", c+1);      return;    }
+    outlet_float(x->x_obj.ob_outlet, atom_getfloat(x->atombuffer+2+c+r*col));
+    break;
+  default:
+    r=atom_getfloat(argv++)-1;
+    c=atom_getfloat(argv++)-1;
+    if ((r<0)||(r>=row)){      post("matrix: row index %d is out of range", r+1);      return;    }
+    if ((c<0)||(c>=col)){      post("matrix: col index %d is out of range", c+1);      return;    }
+    SETFLOAT(x->atombuffer+2+c+r*col, atom_getfloat(argv));
+  }
+}
+
+static void matrix_float(t_matrix *x, t_float f)
+{
+  matrix_set(x, f);
+  matrix_bang(x);
+}
+
+/* ------------- file I/O ------------------ */
+
+static void matrix_read(t_matrix *x, t_symbol *filename)
+{
+  t_binbuf *bbuf = binbuf_new();
+  t_atom *ap;
+  int n;
+
+  if (binbuf_read_via_path(bbuf, filename->s_name, canvas_getdir(x->x_canvas)->s_name, 0))
+    error("matrix: failed to read %s", filename->s_name);
+
+  ap=binbuf_getvec(bbuf);
+  n =binbuf_getnatom(bbuf)-1;
+  
+  if ((ap->a_type == A_SYMBOL) && 
+      (!strcmp(ap->a_w.w_symbol->s_name,"matrix") || !strcmp(ap->a_w.w_symbol->s_name,"#matrix")) ){
+    matrix_matrix2(x, gensym("matrix"), n, ap+1);
+  }
+
+  binbuf_free(bbuf);
+}
+static void matrix_write(t_matrix *x, t_symbol *filename)
+{
+  t_atom *ap=x->atombuffer+2;
+  char filnam[MAXPDSTRING];
+  int rows = x->row, cols = x->col;
+  FILE *f=0;
+
+  sys_bashfilename(filename->s_name, filnam);
+
+  /* open file */
+  if (!(f = fopen(filnam, "w"))) {
+    error("matrix : failed to open %s", filnam);
+  } else {
+    char *text=(char *)getbytes(sizeof(char)*MAXPDSTRING);
+    int textlen;
+
+    /* header:
+     * we now write "#matrix" instead of "matrix",
+     * so that these files can easily read by other 
+     * applications such as octave
+     */
+    sprintf(text, "#matrix %d %d\n", rows, cols);
+    textlen = strlen(text);
+    if (fwrite(text, textlen*sizeof(char), 1, f) < 1) {
+      error("matrix : failed to write %s", filnam); goto end;
+    }
+
+    while(rows--) {
+      int c = cols;
+      while (c--) {
+	t_float val = atom_getfloat(ap++);
+	sprintf(text, "%.15f ", val);
+	textlen=strlen(text);
+	if (fwrite(text, textlen*sizeof(char), 1, f) < 1) {
+	  error("matrix : failed to write %s", filnam); goto end;
+	}
+      }
+      if (fwrite("\n", sizeof(char), 1, f) < 1) {
+	error("matrix : failed to write %s", filnam); goto end;
+      }
+    }
+    freebytes(text, sizeof(char)*MAXPDSTRING);
+  }
+
+ end:
+  /* close file */
+  if (f) fclose(f);
+}
+
+void matrix_free(t_matrix *x)
+{
+  freebytes(x->atombuffer, (x->col*x->row+2)*sizeof(t_atom));
+  x->atombuffer=0;
+  x->col=x->row=0;
+}
+static void matrix_list(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  /* like matrix, but without col/row information, so the previous size is kept */
+  int row=x->row, col=x->col;
+
+  if(!row*col){
+    post("matrix : unknown matrix dimensions");
+    return;
+  }
+  if (argc<row*col){
+    post("matrix: sparse matrices not yet supported : use \"mtx_check\" !");
+    return;
+  }
+  
+  memcpy(x->atombuffer+2, argv, row*col*sizeof(t_atom));
+  matrix_bang(x);
+}
+
+static void *matrix_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(matrix_class);
+  int row, col;
+
+
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("matrix"), gensym(""));
+  outlet_new(&x->x_obj, 0);
+
+  x->atombuffer   = 0;
+  x->x_canvas = canvas_getcurrent();
+
+  switch (argc) {
+  case 0:
+    row = col = 0;
+    break;
+  case 1:
+    if (argv->a_type == A_SYMBOL) {
+      matrix_read(x, argv->a_w.w_symbol);
+      return(x);
+    }
+    row = col = atom_getfloat(argv);
+    break;
+  default:
+    row = atom_getfloat(argv++);
+    col = atom_getfloat(argv++);
+  }
+
+  if(row*col){
+    adjustsize(x, row, col);
+    matrix_set(x, 0);
+  }
+
+  return (x);
+}
+
+void matrix_setup(void)
+{
+  matrix_class = class_new(gensym("matrix"), (t_newmethod)matrix_new, 
+			   (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addcreator((t_newmethod)matrix_new, gensym("mtx"), A_GIMME, 0);
+
+  /* the core : functions for matrices */
+  class_addmethod  (matrix_class, (t_method)matrix_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addmethod  (matrix_class, (t_method)matrix_matrix2, gensym(""), A_GIMME, 0);
+ 
+  /* the basics : functions for creation */
+  class_addmethod  (matrix_class, (t_method)matrix_eye, gensym("eye"), A_GIMME, 0);
+  class_addmethod  (matrix_class, (t_method)matrix_diag, gensym("diag"), A_GIMME, 0);
+  class_addmethod  (matrix_class, (t_method)matrix_ones, gensym("ones"), A_GIMME, 0);
+  class_addmethod  (matrix_class, (t_method)matrix_zeros, gensym("zeros"), A_GIMME, 0);
+  class_addmethod  (matrix_class, (t_method)matrix_egg, gensym("egg"), A_GIMME, 0);
+  class_addmethod  (matrix_class, (t_method)matrix_diegg, gensym("diegg"), A_GIMME, 0);
+ 
+  /* the rest : functions for anything */
+  class_addbang    (matrix_class, matrix_bang);
+  class_addfloat   (matrix_class, matrix_float);
+  class_addlist    (matrix_class, matrix_list);
+  class_addmethod  (matrix_class, (t_method)matrix_row, gensym("row"), A_GIMME, 0);
+  class_addmethod  (matrix_class, (t_method)matrix_col, gensym("column"), A_GIMME, 0);
+  class_addmethod  (matrix_class, (t_method)matrix_col, gensym("col"), A_GIMME, 0);
+  class_addmethod  (matrix_class, (t_method)matrix_element, gensym("element"), A_GIMME, 0);
+
+  /* the file functions */
+  class_addmethod  (matrix_class, (t_method)matrix_write, gensym("write"), A_SYMBOL, 0);
+  class_addmethod  (matrix_class, (t_method)matrix_read , gensym("read") , A_SYMBOL, 0);
+ 
+  class_sethelpsymbol(matrix_class, gensym("iemmatrix/matrix"));
+}
+
+void iemmtx_matrix_setup(void){
+  matrix_setup();
+}
+
+void mtx_matrix_setup(void){
+  matrix_setup();
+}
diff --git a/src/mtx_mean.c b/src/mtx_mean.c
new file mode 100644
index 0000000..bb0d870
--- /dev/null
+++ b/src/mtx_mean.c
@@ -0,0 +1,61 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+
+/* mtx_mean */
+static t_class *mtx_mean_class;
+
+static void mtx_mean_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+  t_atom *ip, *op;
+  int c=col, r;
+  t_float sum;
+  t_float factor=1./row;
+  adjustsize(x, 1, col);
+  op=x->atombuffer;
+
+  while(c--){
+    sum=0;
+    ip=argv+col-c-1;
+    r=row;
+    while(r--)sum+=atom_getfloat(ip+col*r);
+    SETFLOAT(op, sum*factor);
+    op++;
+  }
+  outlet_list(x->x_obj.ob_outlet, gensym("row"), col, x->atombuffer);
+}
+
+static void *mtx_mean_new(void)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_mean_class);
+  outlet_new(&x->x_obj, 0);
+  x->col=x->row=0;
+  x->atombuffer=0;
+  return (x);
+}
+void mtx_mean_setup(void)
+{
+  mtx_mean_class = class_new(gensym("mtx_mean"), (t_newmethod)mtx_mean_new, 
+			     (t_method)matrix_free, sizeof(t_matrix), 0, 0, 0);
+  class_addmethod(mtx_mean_class, (t_method)mtx_mean_matrix, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_mean_class, gensym("iemmatrix/mtx_mean"));
+}
+
+void iemtx_mean_setup(void)
+{
+  mtx_mean_setup();
+}
diff --git a/src/mtx_ones.c b/src/mtx_ones.c
new file mode 100644
index 0000000..c3dccf5
--- /dev/null
+++ b/src/mtx_ones.c
@@ -0,0 +1,56 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_ones */
+static t_class *mtx_ones_class;
+static void *mtx_ones_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_ones_class);
+  int col=0, row=0;
+  outlet_new(&x->x_obj, 0);
+  x->row = x->col = 0;
+  x->atombuffer   = 0;
+  switch(argc) {
+  case 0:
+    break;
+  case 1:
+    col=row=atom_getfloat(argv);
+    break;
+  default:
+    row=atom_getfloat(argv++);
+    col=atom_getfloat(argv);
+  }
+  if(col<0)col=0;
+  if(row<0)row=0;
+  if (col*row){
+    x->atombuffer = (t_atom *)getbytes((col*row+2)*sizeof(t_atom));
+    setdimen(x, row, col);
+    matrix_set(x, 1);
+  }
+  return (x);
+}
+void mtx_ones_setup(void)
+{
+  mtx_ones_class = class_new(gensym("mtx_ones"), (t_newmethod)mtx_ones_new, 
+			     (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addlist(mtx_ones_class, matrix_ones);
+  class_addbang(mtx_ones_class, matrix_bang);
+  class_addmethod(mtx_ones_class, (t_method)matrix_ones, gensym("matrix"), A_GIMME, 0);
+
+  class_sethelpsymbol(mtx_ones_class, gensym("iemmatrix/mtx_special"));
+}
+void iemtx_ones_setup(void){
+  mtx_ones_setup();
+}
diff --git a/src/mtx_pivot.c b/src/mtx_pivot.c
new file mode 100644
index 0000000..1ac4804
--- /dev/null
+++ b/src/mtx_pivot.c
@@ -0,0 +1,171 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+
+/* mtx_pivot */
+static t_class *mtx_pivot_class;
+
+typedef struct _mtx_pivot
+{
+  t_object x_obj;
+
+  t_matrix m;  // the output matrix
+  t_matrix m_pre;  // the pre -multiply matrix
+  t_matrix m_post; // the post-multiply matrix
+
+  t_outlet *pivo, *pre, *post;
+  
+} t_mtx_pivot;
+
+static void mtx_pivot_matrix(t_mtx_pivot *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv);
+  int col=atom_getfloat(argv+1);
+  t_atom *m_pre, *m_post;
+  int i, j, k;
+  int min_rowcol = (row<col)?row:col;
+  t_matrixfloat *buffer, *buf;
+  int *i_pre, *i_post, *i_buf;
+
+  int pivot_row, pivot_col;
+
+  if (argc<2){    post("mtx_pivot: crippled matrix");    return;  }
+  if ((col<1)||(row<1)) {    post("mtx_pivot: invalid dimensions");    return;  }
+  if (col*row>argc-2){    post("sparse matrix not yet supported : use \"mtx_check\"");    return;  }
+
+  adjustsize(&x->m, row, col);
+  adjustsize(&x->m_pre, row, row);
+  adjustsize(&x->m_post,col, col);
+  matrix_set(&x->m_pre, 0);
+  matrix_set(&x->m_post, 0);
+
+  buffer = matrix2float(argv);
+  i_pre    = (int *)getbytes(sizeof(int)*row);
+  i_post   = (int *)getbytes(sizeof(int)*col);
+
+  /* clear pre&post matrices */
+  i=row;
+  i_buf=i_pre;
+  while(i--)*i_buf++=row-i-1;
+  i=col;
+  i_buf=i_post;
+  while(i--)*i_buf++=col-i-1;
+
+  /* do the pivot thing */
+
+  for (k=0; k<min_rowcol-1; k++){
+    // 1. find max_element
+    t_matrixfloat max = 0;
+    pivot_row = pivot_col = k;
+
+    for(i=k; i<row; i++){
+      buf=buffer+col*i+k;
+
+      j=col-k;
+      while(j--){
+	t_matrixfloat f = fabsf(*buf++);
+	if (f>max) {
+	  max=f;
+	  pivot_row = i;
+	  pivot_col = col-j-1;
+	}
+      }
+    }
+    // 2. move max el to [k,k]
+    // 2a swap rows
+    if (k-pivot_row) {
+      t_matrixfloat *oldrow=buffer+col*k;
+      t_matrixfloat *newrow=buffer+col*pivot_row;
+
+      i=col;
+      while(i--){
+	t_matrixfloat f=*oldrow;
+	*oldrow++=*newrow;
+	*newrow++=f;
+      }
+      i=i_pre[k];
+      i_pre[k]=i_pre[pivot_row];
+      i_pre[pivot_row]=i;
+    }
+    // 2b swap columns
+    if (k-pivot_col) {
+      t_matrixfloat *oldcol=buffer+k;
+      t_matrixfloat *newcol=buffer+pivot_col;
+
+      i=row;
+      while(i--){
+	t_matrixfloat f=*oldcol;
+	*oldcol=*newcol;
+	*newcol=f;
+	oldcol+=col;
+	newcol+=col;
+      }
+      i=i_post[k];
+      i_post[k]=i_post[pivot_col];
+      i_post[pivot_col]=i;
+    }
+  }
+
+  float2matrix(x->m.atombuffer, buffer);
+
+  i=col;
+  m_post = x->m_post.atombuffer+2;
+  while(i--){
+    SETFLOAT(m_post+i_post[i]*col+i, 1);
+  }
+  i=row;
+  m_pre = x->m_pre.atombuffer+2;
+  while(i--)SETFLOAT(m_pre+i_pre[i]+i*col, 1);
+
+  
+  outlet_anything(x->post, gensym("matrix"), 2+col*col, x->m_post.atombuffer);
+  outlet_anything(x->pre, gensym("matrix"), 2+row*row, x->m_pre.atombuffer);
+  outlet_anything(x->pivo , gensym("matrix"), 2+row*col, x->m.atombuffer );
+}
+
+static void mtx_pivot_free(t_mtx_pivot *x)
+{
+  matrix_free(&x->m);
+  matrix_free(&x->m_pre);
+  matrix_free(&x->m_post);
+}
+
+static void *mtx_pivot_new(void)
+{
+  t_mtx_pivot *x = (t_mtx_pivot *)pd_new(mtx_pivot_class);
+
+  x->pivo = outlet_new(&x->x_obj, 0);
+  x->pre  = outlet_new(&x->x_obj, 0);
+  x->post = outlet_new(&x->x_obj, 0);
+
+  x->m.atombuffer = x->m_pre.atombuffer = x->m_post.atombuffer = 0;
+  x->m.row = x->m.col = x->m_pre.row = x->m_pre.col = x->m_post.row = x->m_post.col = 0;
+
+  return(x);
+}
+
+void mtx_pivot_setup(void)
+{
+  mtx_pivot_class = class_new(gensym("mtx_pivot"), (t_newmethod)mtx_pivot_new, (t_method)mtx_pivot_free,
+			      sizeof(t_mtx_pivot), 0, 0, 0);
+  class_addmethod(mtx_pivot_class, (t_method)mtx_pivot_matrix, gensym("matrix"), A_GIMME, 0);
+
+  class_sethelpsymbol(mtx_pivot_class, gensym("iemmatrix/mtx_transpose"));
+}
+
+void iemtx_pivot_setup(void)
+{
+  mtx_pivot_setup();
+}
diff --git a/src/mtx_print.c b/src/mtx_print.c
new file mode 100644
index 0000000..3b1d028
--- /dev/null
+++ b/src/mtx_print.c
@@ -0,0 +1,60 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+
+#include "iemmatrix.h"
+
+/* mtx_print */
+static t_class *mtx_print_class;
+static void mtx_print(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int col, row;
+  if (argc<2){
+    post("mtx_print : crippled matrix");
+    return;
+  }
+  row = atom_getfloat(argv++);
+  col = atom_getfloat(argv++);
+  if(row*col>argc-2){
+    post("mtx_print : sparse matrices not yet supported : use \"mtx_check\"");
+    return;
+  }
+  post("matrix:");
+  while(row--){
+    postatom(col, argv);
+    argv+=col;
+    endpost();
+  }
+  endpost();
+}
+static void *mtx_print_new(void)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_print_class);
+  x->row = x->col = 0;
+  x->atombuffer   = 0;
+  return (x);
+}
+void mtx_print_setup(void)
+{
+  mtx_print_class = class_new(gensym("mtx_print"), (t_newmethod)mtx_print_new, 
+			      0, sizeof(t_matrix), 0, 0, 0);
+  class_addmethod  (mtx_print_class, (t_method)mtx_print, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_print_class, gensym("iemmatrix/matrix"));
+}
+
+void iemtx_print_setup(void){
+  mtx_print_setup();
+}
+
diff --git a/src/mtx_rand.c b/src/mtx_rand.c
new file mode 100644
index 0000000..dee481a
--- /dev/null
+++ b/src/mtx_rand.c
@@ -0,0 +1,93 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_rand */
+static t_class *mtx_rand_class;
+
+static void mtx_rand_seed(t_matrix *x, t_float f)
+{
+  x->current_row=f;
+}
+static int makeseed(void)
+{
+  static unsigned int random_nextseed = 1489853723;
+  random_nextseed = random_nextseed * 435898247 + 938284287;
+  return (random_nextseed & 0x7fffffff);
+}
+static void mtx_rand_random(t_matrix *x)
+{
+  long size = x->row * x->col;
+  t_atom *ap=x->atombuffer+2;
+  int val = x->current_row;
+  while(size--)SETFLOAT(ap+size, ((float)(((val=val*435898247+382842987)&0x7fffffff)-0x40000000))*(float)(0.5/0x40000000)+0.5);
+  x->current_row=val;
+}
+
+static void mtx_rand_list(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row = atom_getfloat(argv++);
+  int col = atom_getfloat(argv++);
+
+  if(!argv)return;
+  if(argc==1)col=row;
+
+  adjustsize(x, row, col);
+  mtx_rand_random(x);
+  matrix_bang(x);
+}
+static void mtx_rand_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  matrix_matrix2(x, s, argc, argv);
+  mtx_rand_random(x);
+  matrix_bang(x);
+}
+static void mtx_rand_bang(t_matrix *x)
+{
+  mtx_rand_random(x);
+  matrix_bang(x);
+}
+static void *mtx_rand_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_rand_class);
+  int row, col;
+  outlet_new(&x->x_obj, 0);
+  x->col=x->row=0;
+  x->atombuffer=0;
+  x->current_row=makeseed();
+
+  if (argc) {
+	row=atom_getfloat(argv);
+	col=(argc>1)?atom_getfloat(argv+1):row;
+	adjustsize(x, row, col);
+	mtx_rand_random(x);
+  }
+  return (x);
+}
+void mtx_rand_setup(void)
+{
+  mtx_rand_class = class_new(gensym("mtx_rand"), (t_newmethod)mtx_rand_new, 
+			     (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addmethod(mtx_rand_class, (t_method)mtx_rand_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addlist  (mtx_rand_class, mtx_rand_list);
+  class_addbang  (mtx_rand_class, mtx_rand_bang);
+
+  class_addmethod(mtx_rand_class, (t_method)mtx_rand_seed, gensym("seed"), A_FLOAT, 0);
+  class_sethelpsymbol(mtx_rand_class, gensym("iemmatrix/mtx_rand"));
+}
+
+void iemmtx_rand_setup(void){
+  mtx_rand_setup();
+}
+
diff --git a/src/mtx_resize.c b/src/mtx_resize.c
new file mode 100644
index 0000000..edc2e17
--- /dev/null
+++ b/src/mtx_resize.c
@@ -0,0 +1,103 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_resize */
+
+static t_class *mtx_resize_class;
+static void mtx_resize_list2(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int r, c;
+  if (argc<1)return;
+  if (argc>2)error("mtx_resize : only rows & cols are needed, skipping the rest");
+  if (argc==1)r=c=atom_getfloat(argv++);
+  else{
+    r=atom_getfloat(argv++);
+    c=atom_getfloat(argv++);
+  }
+
+  if (r<0)r=0;
+  if (c<0)c=0;
+
+  x->current_row = r;
+  x->current_col = c;
+}
+
+static void mtx_resize_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv);
+  int col=atom_getfloat(argv+1);
+  int r = x->current_row, c = x->current_col;
+  int R=0, ROW, COL;
+
+  if (argc<2){    post("mtx_add: crippled matrix");    return;  }
+  if ((col<1)||(row<1)) {    post("mtx_add: invalid dimensions");    return;  }
+  if (col*row>argc-2){    post("sparse matrix not yet supported : use \"mtx_check\"");    return;  }
+
+  if (!r)r=row;
+  if (!c)c=col;
+
+  if (r==row && c==col) { // no need to change
+    outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, argv);
+    return;
+  }
+
+  x->atombuffer=(t_atom *)getbytes((c*r+2)*sizeof(t_atom));
+  setdimen(x, r, c);
+  matrix_set(x, 0);
+
+  ROW=(r<row)?r:row;
+  COL=(c<col)?c:col;
+  R=ROW;
+  while(R--)memcpy(x->atombuffer+2+(ROW-R-1)*c, argv+2+(ROW-R-1)*col, COL*sizeof(t_atom));
+      
+  matrix_bang(x);
+
+  freebytes(x->atombuffer, (c*r+2)*sizeof(t_atom));
+}
+
+static void *mtx_resize_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_resize_class);
+  int c=0, r=0;
+
+  if(argc){
+    if(argc-1){
+      r=atom_getfloat(argv);
+      c=atom_getfloat(argv+1);
+    } else r=c=atom_getfloat(argv);
+    if(c<0)c=0;
+    if(r<0)r=0;
+  }
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym(""));
+  outlet_new(&x->x_obj, 0);
+  x->current_row = r;
+  x->current_col = c;
+  x->row = x->col= 0;
+  x->atombuffer  = 0;
+
+  return (x);
+}
+void mtx_resize_setup(void)
+{
+  mtx_resize_class = class_new(gensym("mtx_resize"), (t_newmethod)mtx_resize_new, 
+			       0, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addmethod  (mtx_resize_class, (t_method)mtx_resize_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addmethod  (mtx_resize_class, (t_method)mtx_resize_list2,  gensym(""), A_GIMME, 0);
+  class_sethelpsymbol(mtx_resize_class, gensym("iemmatrix/mtx_size"));
+}
+void iemtx_resize_setup(void){
+  mtx_resize_setup();
+}
+
diff --git a/src/mtx_roll.c b/src/mtx_roll.c
new file mode 100644
index 0000000..a437b06
--- /dev/null
+++ b/src/mtx_roll.c
@@ -0,0 +1,73 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_roll */
+/* roll the rows */
+static t_class *mtx_roll_class;
+
+static void mtx_roll_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+  t_atom *ap;
+  int colroll = ((int)x->f%col+col)%col;
+  int c;
+
+  if(row*col>argc-2) {
+    post("mtx_roll: sparse matrices not yet supported : use \"mtx_check\"");
+    return;
+  }
+
+  adjustsize(x, row, col);
+  ap = x->atombuffer+2;
+
+  c=col;
+  while(c--){
+    t_atom *in  = argv+col-c-1;
+    t_atom *out = ap  +(col-c-1+colroll)%col;
+    int r = row;
+    while (r--){
+      SETFLOAT(out, atom_getfloat(in));
+      out+=col;
+      in+=col;
+    }
+
+  }
+
+  matrix_bang(x);
+}
+
+static void *mtx_roll_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_roll_class);
+  floatinlet_new(&x->x_obj, &(x->f));
+  outlet_new(&x->x_obj, 0);
+
+  x->f=argc?atom_getfloat(argv):0;
+  x->col=x->row=0;
+  x->atombuffer=0;
+  return (x);
+}
+void mtx_roll_setup(void)
+{
+  mtx_roll_class = class_new(gensym("mtx_roll"), (t_newmethod)mtx_roll_new, 
+				  (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addbang  (mtx_roll_class, matrix_bang);
+  class_addmethod(mtx_roll_class, (t_method)mtx_roll_matrix, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_roll_class, gensym("iemmatrix/mtx_transpose"));
+}
+void iemtx_roll_setup(void){
+  mtx_roll_setup();
+}
diff --git a/src/mtx_row.c b/src/mtx_row.c
new file mode 100644
index 0000000..e88aae8
--- /dev/null
+++ b/src/mtx_row.c
@@ -0,0 +1,120 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_row */
+static t_class *mtx_row_class;
+
+static void mtx_row_float(t_matrix *x, t_floatarg f)
+{
+  int i = f;
+  if(i<0)i=0;
+  x->current_row = i;
+}
+static void mtx_row_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row, col;
+  if (argc<2){    post("matrix : corrupt matrix passed");    return;  }
+  row = atom_getfloat(argv);
+  col = atom_getfloat(argv+1);
+  if ((row<1)||(col<1)){    post("matrix : corrupt matrix passed");    return;  }
+  if (row*col > argc-2){    post("matrix: sparse matrices not yet supported : use \"mtx_check\"");    return;  }
+  matrix_matrix2(x, s, argc, argv);
+  matrix_bang(x);
+}
+static void mtx_row_list(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  if (argc==1){
+    t_float f=atom_getfloat(argv);
+    t_atom *ap=x->atombuffer+2+(x->current_row-1)*x->col;
+    if (x->current_row>x->row){
+      post("mtx_row : too high a row is to be set");
+      return;
+    }
+    if (x->current_row){
+      int n=x->col;
+      while(n--){
+	SETFLOAT(ap, f);
+	ap++;
+      }
+    }
+    matrix_bang(x);
+    return;
+  }
+
+  if (argc<x->col){
+    post("mtx_row : row length is too small for %dx%d-matrix", x->row, x->col);
+    return;
+  }
+  if (x->current_row>x->row){
+    post("mtx_row : too high a row is to be set");
+    return;
+  }
+  if(x->current_row) {memcpy(x->atombuffer+2+(x->current_row-1)*x->col, argv, x->col*sizeof(t_atom));
+  }  else {
+    int r=x->row;
+    while(r--)memcpy(x->atombuffer+2+r*x->col, argv, x->col*sizeof(t_atom));      
+  }
+  matrix_bang(x);
+}
+static void *mtx_row_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_row_class);
+  int i, j, q;
+
+  outlet_new(&x->x_obj, 0);
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym(""));
+  x->current_row=0;
+  x->col=x->row=0;
+  x->atombuffer=0;
+  switch (argc) {
+  case 0:break;
+  case 1:
+    i = atom_getfloat(argv);
+    if (i<0)i=0;
+    if(i)adjustsize(x, i, i);
+    matrix_set(x, 0);
+    break;
+  case 2:
+    i = atom_getfloat(argv++);if(i<0)i=0;
+    j = atom_getfloat(argv++);if(j<0)j=0;
+    if(i*j)adjustsize(x, i, j);
+    matrix_set(x, 0);
+    break;
+  default:
+    i = atom_getfloat(argv++);if(i<0)i=0;
+    j = atom_getfloat(argv++);if(j<0)j=0;
+    q = atom_getfloat(argv++);if(q<0)q=0;
+    if(i*j)adjustsize(x, i, j);
+    matrix_set(x, 0);
+    x->current_row=q;
+  }
+  return (x);
+}
+void mtx_row_setup(void)
+{
+  mtx_row_class = class_new(gensym("mtx_row"), (t_newmethod)mtx_row_new, 
+			    (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addbang  (mtx_row_class, matrix_bang);
+  class_addlist  (mtx_row_class, mtx_row_list);
+  class_addmethod(mtx_row_class, (t_method)mtx_row_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addmethod(mtx_row_class, (t_method)mtx_row_float, gensym(""), A_FLOAT, 0);
+  class_sethelpsymbol(mtx_row_class, gensym("iemmatrix/mtx_element"));
+}
+
+
+void iemmtx_row_setup(void)
+{
+  mtx_row_setup();
+}
diff --git a/src/mtx_scroll.c b/src/mtx_scroll.c
new file mode 100644
index 0000000..5b4fffa
--- /dev/null
+++ b/src/mtx_scroll.c
@@ -0,0 +1,59 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_scroll */
+/* scroll the rows */
+static t_class *mtx_scroll_class;
+
+static void mtx_scroll_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+  int rowscroll = ((int)x->f%row+row)%row;
+
+  if(row*col>argc-2) {
+    post("mtx_scroll: sparse matrices not yet supported : use \"mtx_check\"");
+    return;
+  }
+  adjustsize(x, row, col);
+
+  memcpy(x->atombuffer+2, argv+(row-rowscroll)*col, rowscroll*col*sizeof(t_atom));
+  memcpy(x->atombuffer+2+rowscroll*col, argv, (row-rowscroll)*col*sizeof(t_atom));
+
+  matrix_bang(x);
+}
+
+static void *mtx_scroll_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_scroll_class);
+  floatinlet_new(&x->x_obj, &(x->f));
+  outlet_new(&x->x_obj, 0);
+
+  x->f=argc?atom_getfloat(argv):0;
+  x->col=x->row=0;
+  x->atombuffer=0;
+  return (x);
+}
+void mtx_scroll_setup(void)
+{
+  mtx_scroll_class = class_new(gensym("mtx_scroll"), (t_newmethod)mtx_scroll_new, 
+				  (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addbang  (mtx_scroll_class, matrix_bang);
+  class_addmethod(mtx_scroll_class, (t_method)mtx_scroll_matrix, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_scroll_class, gensym("iemmatrix/mtx_transpose"));
+}
+void iemtx_scroll_setup(void){
+  mtx_scroll_setup();
+}
diff --git a/src/mtx_size.c b/src/mtx_size.c
new file mode 100644
index 0000000..43dbba1
--- /dev/null
+++ b/src/mtx_size.c
@@ -0,0 +1,54 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_size */
+static t_class *mtx_size_class;
+typedef struct _mtx_size
+{
+  t_object x_obj;
+
+  int      row;
+  int      col;
+
+  t_outlet *left, *right;
+} t_mtx_size;
+
+static void mtx_size_matrix(t_mtx_size *x, t_symbol *s, int argc, t_atom *argv)
+{
+  if(argc<2)return;
+  outlet_float(x->right, atom_getfloat(argv+1));
+  outlet_float(x->left,  atom_getfloat(argv));
+
+}
+
+static void *mtx_size_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_mtx_size *x = (t_mtx_size *)pd_new(mtx_size_class);
+  x->left  = outlet_new(&x->x_obj, 0);
+  x->right = outlet_new(&x->x_obj, 0);
+
+  return (x);
+}
+void mtx_size_setup(void)
+{
+  mtx_size_class = class_new(gensym("mtx_size"), (t_newmethod)mtx_size_new, 
+			     0, sizeof(t_mtx_size), 0, A_GIMME, 0);
+  class_addmethod(mtx_size_class, (t_method)mtx_size_matrix, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_size_class, gensym("iemmatrix/mtx_size"));
+}
+
+void iemtx_size_setup(void){
+  mtx_size_setup();
+}
diff --git a/src/mtx_tilde.c b/src/mtx_tilde.c
new file mode 100644
index 0000000..88dc5f9
--- /dev/null
+++ b/src/mtx_tilde.c
@@ -0,0 +1,413 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+
+/*
+  the sigmatrix objects ::
+  mtx_*~      : multiply a n-vector of in~ with a matrix to get a m-vector of out~
+                 line~ between the 2 matrices, to make it useable as a mixer
+*/
+
+
+/* --------------------------- matrix~ ----------------------------------
+ *
+ * multiply a n-vector of signals with a (n*m) matrix, to get m output-streams.
+ * make the (n*m)-matrix of scalars to be liny~
+ *
+ *  1703:forum::für::umläute:2001
+ */
+
+static t_class *mtx_multilde_class;
+
+typedef struct _mtx_multilde {
+  t_object x_obj;
+
+  t_float time;
+  int ticksleft;
+  int retarget;
+  t_float msec2tick;
+
+  t_float**value;
+  t_float**target;
+  t_float**increment; /* single precision is really a bad, especially when doing long line~s.
+			* but the biginc (like in msp's line~ (d_ctl.c) is far too expensive... */
+  t_float**sigIN;
+  t_float**sigOUT;
+  t_float *sigBUF;
+
+  int      n_sigIN;    /* columns */
+  int      n_sigOUT;   /* rows    */
+
+  int      compatibility; /* 0=default; 1=zexy; 2=iemlib */
+} t_mtx_multilde;
+
+/* the message thing */
+
+static void mtx_multilde_matrix_default(t_mtx_multilde *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int col, row, c=0, r=0;
+
+  if (argc<2){
+    post("matrix~ : bad matrix !");
+    return;
+  }
+
+  row = atom_getfloat(argv++);
+  col = atom_getfloat(argv++);
+  argc-=2;
+
+  if((col!=x->n_sigOUT)||(row!=x->n_sigIN)){
+    post("matrix~ : matrix dimensions do not match !!");
+    return;
+  }
+  if(argc<row*col){
+    post("matrix~ : reduced matrices not yet supported");
+    return;
+  }
+
+  if (x->time<=0) {
+    for(r=0; r<row; r++)
+      for(c=0; c<col; c++)
+	x->target[c][r]=x->value[c][r]=atom_getfloat(argv++);
+    x->time=x->ticksleft=x->retarget=0;
+  } else {
+    for(r=0; r<row; r++)
+      for(c=0; c<col; c++)
+	x->target[c][r]=atom_getfloat(argv++);
+    x->retarget=1;
+  }
+}
+
+static void mtx_multilde_matrix_zexy(t_mtx_multilde *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int col, row, c=0, r=0;
+
+  if (argc<2){
+    post("matrix~ : bad matrix !");
+    return;
+  }
+
+  row = atom_getfloat(argv++);
+  col = atom_getfloat(argv++);
+  argc-=2;
+
+  if((col!=x->n_sigOUT)||(row!=x->n_sigIN)){
+    post("matrix~ : matrix dimensions do not match !!");
+    return;
+  }
+  if(argc<row*col){
+    post("matrix~ : reduced matrices not yet supported");
+    return;
+  }
+
+  if (x->time<=0) {
+    for(r=0; r<row; r++)
+      for(c=0; c<col; c++)
+	x->target[c][r]=x->value[c][r]=atom_getfloat(argv++);
+    x->time=x->ticksleft=x->retarget=0;
+  } else {
+    for(r=0; r<row; r++)
+      for(c=0; c<col; c++)
+	x->target[c][r]=atom_getfloat(argv++);
+    x->retarget=1;
+  }
+}
+
+static void mtx_multilde_matrix_iemlib(t_mtx_multilde *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int col, row, c=0, r=0;
+
+  if (argc<2){
+    post("matrix~ : bad matrix !");
+    return;
+  }
+
+  row = atom_getfloat(argv++);
+  col = atom_getfloat(argv++);
+  argc-=2;
+
+  if((col!=x->n_sigOUT)||(row!=x->n_sigIN)){
+    post("matrix~ : matrix dimensions do not match !!");
+    return;
+  }
+  if(argc<row*col){
+    post("matrix~ : reduced matrices not yet supported");
+    return;
+  }
+
+  if (x->time<=0) {
+    for(r=0; r<row; r++)
+      for(c=0; c<col; c++)
+	x->target[c][r]=x->value[c][r]=atom_getfloat(argv++);
+    x->time=x->ticksleft=x->retarget=0;
+  } else {
+    for(r=0; r<row; r++)
+      for(c=0; c<col; c++)
+	x->target[c][r]=atom_getfloat(argv++);
+    x->retarget=1;
+  }
+}
+static void mtx_multilde_matrix(t_mtx_multilde *x, t_symbol *s, int argc, t_atom *argv){
+  switch (x->compatibility){
+  default:mtx_multilde_matrix_default(x,s,argc,argv);
+    break;
+  case 1:mtx_multilde_matrix_zexy(x,s,argc,argv);
+    break;
+  case 2:mtx_multilde_matrix_iemlib(x,s,argc,argv);
+    break;
+  }
+}
+
+static void mtx_multilde_stop(t_mtx_multilde *x)
+{
+  int c = x->n_sigOUT, r;
+  t_float *tgt, *val;
+  while(c--){
+    tgt=x->target[c];
+    val=x->value [c];
+    r=x->n_sigIN;
+    while(r--)*tgt++=*val++;
+  }
+  x->ticksleft = x->retarget = 0;
+}
+
+
+/* the dsp thing */
+
+static t_int *mtx_multilde_perform(t_int *w)
+{
+  t_mtx_multilde *x = (t_mtx_multilde *)(w[1]);
+  int n = (int)(w[2]);
+
+  int r, c;
+
+  t_float **out = x->sigOUT;
+  t_float **in  = x->sigIN;
+
+  t_float  *buf = x->sigBUF, *sigBUF = buf;
+
+  t_float **value     = x->value;
+  t_float **target    = x->target;
+  t_float **increment = x->increment;
+
+  t_float *inc, *val, *tgt;
+
+  int n_IN=x->n_sigIN, n_OUT=x->n_sigOUT;
+
+  if (x->retarget) {
+    int nticks = x->time * x->msec2tick;
+    t_float oneovernos;
+
+    if (!nticks) nticks = 1;
+    oneovernos = 1./(nticks*n);
+    x->ticksleft = nticks;
+
+    c = n_OUT;
+    while(c--) {
+      inc=increment[c];
+      val=value[c];
+      tgt=target[c];
+      r=n_IN;
+      while(r--)*inc++=(*tgt++-*val++)*oneovernos;
+    }
+
+    x->retarget = 0;
+  }
+
+  if (x->ticksleft) {
+    int N=n-1;
+    n=-1;
+    //    while (n--) {
+    while(n++<N){
+      c = n_OUT;
+      while(c--) {
+	t_float sum = 0;
+	val = value[c]+n_IN-1;
+	inc = increment[c]+n_IN-1;
+	r=n_IN;
+
+	while(r--)sum+=in[r][n]*(*val--+=*inc--);
+
+	sigBUF[c]=sum;
+      }
+      buf = sigBUF;
+      c = n_OUT;
+      while(c--)out[c][n]=*buf++;
+    }
+    if (!--x->ticksleft) {
+      c = n_OUT;
+      while(c--){
+	val=value[c];
+	tgt=target[c];
+	r=n_IN;
+	while(r--)*val++=*tgt++;
+      }
+    }
+  } else { /* no ticks left */
+    while (n--) {
+      c = n_OUT;
+      while(c--) {
+	t_float sum = 0;
+	val = value[c]+n_IN-1;
+	r = n_IN;
+	while(r--)sum+=in[r][n]**val--; 
+	sigBUF[c]=sum;
+      }
+      buf = sigBUF;
+      c = n_OUT;
+      while(c--)out[c][n]=*buf++;
+    }
+  }
+  return (w+3);
+}
+
+static void mtx_multilde_dsp(t_mtx_multilde *x, t_signal **sp)
+{
+  int o = x->n_sigOUT, i=x->n_sigIN, n=0;
+  t_float **dummy = x->sigIN;
+
+  while(i--)*dummy++=sp[n++]->s_vec;
+
+  dummy =x->sigOUT;
+  while(o--)dummy[o]=sp[n++]->s_vec;
+
+  x->msec2tick = sp[0]->s_sr / (1000.f * sp[0]->s_n);
+  dsp_add(mtx_multilde_perform, 2, x, sp[0]->s_n);
+}
+
+
+/* setup/setdown things */
+
+static void mtx_multilde_free(t_mtx_multilde *x)
+{
+  int i = x->n_sigOUT;
+  while(i--) {
+    freebytes(x->value    [i], x->n_sigOUT * sizeof(t_float *));
+    freebytes(x->target   [i], x->n_sigOUT * sizeof(t_float *));
+    freebytes(x->increment[i], x->n_sigOUT * sizeof(t_float *));
+  }
+
+  freebytes(x->value,     sizeof(x->value));
+  freebytes(x->target,    sizeof(x->target));
+  freebytes(x->increment, sizeof(x->increment));
+
+  freebytes(x->sigIN,    x->n_sigIN  * sizeof(t_float *));
+  freebytes(x->sigOUT,   x->n_sigOUT * sizeof(t_float *));
+  freebytes(x->sigBUF,   x->n_sigOUT * sizeof(t_float  ));
+}
+
+static void *mtx_multilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+    t_mtx_multilde *x = (t_mtx_multilde *)pd_new(mtx_multilde_class);
+    int i;
+    int InOut=0;
+    x->compatibility=0;
+
+    if(s==gensym("matrix~")){ // zexy-compat
+      error("[matrix~] is deprecated");//; use [mtx_*~] instead");
+      x->compatibility=1;
+      InOut=1;
+    }
+
+    if(s==gensym("matrix_mul~")){ // iemlib-compat
+      error("[matrix_mul~] is deprecated; use [mtx_*~] instead");
+      x->compatibility=2;
+      InOut=1;
+    }
+
+    x->time = 0;
+
+    switch (argc) {
+    case 0:
+      x->n_sigIN = x->n_sigOUT = 1;
+     break;
+    case 1:
+      x->n_sigIN = x->n_sigOUT = atom_getfloat(argv);
+      break;
+    default:
+      x->time= atom_getfloat(argv+2);
+    case 2:
+      if(InOut){
+	x->n_sigIN  = atom_getfloat(argv);
+	x->n_sigOUT = atom_getfloat(argv+1);
+      } else {
+	x->n_sigOUT = atom_getfloat(argv);
+	x->n_sigIN  = atom_getfloat(argv+1);
+      }
+      break;
+    }
+
+    if (x->time<0) x->time=0;
+    if (x->n_sigIN <1) x->n_sigIN =1;
+    if (x->n_sigOUT<1) x->n_sigOUT=1;
+
+    /* the inlets */
+    i=x->n_sigIN-1;
+    while(i--)inlet_new(&x->x_obj,&x->x_obj.ob_pd,&s_signal,&s_signal);
+    inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("matrix"), gensym(""));
+    floatinlet_new(&x->x_obj, &x->time);
+
+    /* the outlets */
+    i=x->n_sigOUT;
+    while(i--)outlet_new(&x->x_obj,&s_signal);
+
+    /* make all the buffers */
+    x->sigIN  = (t_float**)getbytes(x->n_sigIN  * sizeof(t_float*));
+    x->sigOUT = (t_float**)getbytes(x->n_sigOUT * sizeof(t_float*));
+    x->sigBUF = (t_float *)getbytes(x->n_sigOUT * sizeof(t_float ));
+
+    x->value     = (t_float **)getbytes(x->n_sigOUT * sizeof(t_float));
+    x->target    = (t_float **)getbytes(x->n_sigOUT * sizeof(t_float));
+    x->increment = (t_float **)getbytes(x->n_sigOUT * sizeof(t_float));
+
+    i = x->n_sigOUT;
+    while(i--){
+      int j = x->n_sigIN;
+      x->sigOUT   [i] = 0;
+      x->value    [i] = (t_float *)getbytes(x->n_sigIN * sizeof(t_float));
+      x->target   [i] = (t_float *)getbytes(x->n_sigIN * sizeof(t_float));
+      x->increment[i] = (t_float *)getbytes(x->n_sigIN * sizeof(t_float));
+
+      while(j--)x->value[i][j]=x->target[i][j]=x->increment[i][j]=0;
+    }
+
+    i = x->n_sigIN;
+    while(i--)x->sigIN[i] = 0;    
+
+    x->msec2tick = x->ticksleft = x->retarget = 0;
+    return (x);
+}
+
+static void mtx_multilde_setup(void)
+{
+  mtx_multilde_class = class_new(gensym("mtx_*~"), (t_newmethod)mtx_multilde_new, 
+				 (t_method)mtx_multilde_free,
+				 sizeof(t_mtx_multilde), 0, A_GIMME, 0);
+
+  class_addcreator((t_newmethod)mtx_multilde_new, gensym("matrix~"), A_GIMME,0);
+
+  class_addmethod(mtx_multilde_class, (t_method)mtx_multilde_dsp, gensym("dsp"), 0);
+  class_addmethod(mtx_multilde_class, nullfn, gensym("signal"), 0);
+
+  class_addmethod(mtx_multilde_class, (t_method)mtx_multilde_matrix, gensym(""), A_GIMME, 0);
+  class_addmethod(mtx_multilde_class, (t_method)mtx_multilde_stop, gensym("stop"), 0);
+
+  class_sethelpsymbol(mtx_multilde_class, gensym("iemmatrix/matrix~"));
+}
+
+void mtx_tilde_setup(void)
+{
+  mtx_multilde_setup();
+}
diff --git a/src/mtx_trace.c b/src/mtx_trace.c
new file mode 100644
index 0000000..ba5b3db
--- /dev/null
+++ b/src/mtx_trace.c
@@ -0,0 +1,57 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_trace */
+static t_class *mtx_trace_class;
+typedef struct _mtx_trace
+{
+  t_object x_obj;
+  t_float trace;
+} t_mtx_trace;
+static void mtx_trace_bang(t_mtx_trace *x)
+{
+  outlet_float(x->x_obj.ob_outlet, x->trace);
+}
+static void mtx_trace_matrix(t_mtx_trace *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+  int length=(col<row)?col:row;
+  t_float trace = 0;
+  if(row*col>argc-2)post("mtx_trace: sparse matrices not yet supported : use \"mtx_check\"");
+  else while(length--)trace+=atom_getfloat(argv+length*(col+1));
+  x->trace=trace;
+  mtx_trace_bang(x);
+}
+static void *mtx_trace_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_mtx_trace *x = (t_mtx_trace *)pd_new(mtx_trace_class);
+  outlet_new(&x->x_obj, 0);
+  x->trace=0;
+  return (x);
+}
+void mtx_trace_setup(void)
+{
+  mtx_trace_class = class_new(gensym("mtx_trace"), (t_newmethod)mtx_trace_new, 
+			      0, sizeof(t_mtx_trace), 0, A_GIMME, 0);
+  class_addbang  (mtx_trace_class, mtx_trace_bang);
+  class_addmethod(mtx_trace_class, (t_method)mtx_trace_matrix, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_trace_class, gensym("iemmatrix/mtx_trace"));
+}
+
+void iemtx_trace_setup(void)
+{
+  mtx_trace_setup();
+}
diff --git a/src/mtx_transpose.c b/src/mtx_transpose.c
new file mode 100644
index 0000000..7034cae
--- /dev/null
+++ b/src/mtx_transpose.c
@@ -0,0 +1,67 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_transpose */
+static t_class *mtx_transpose_class;
+
+static void mtx_transpose_matrix(t_matrix *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int row=atom_getfloat(argv++);
+  int col=atom_getfloat(argv++);
+  t_atom *ap;
+  int r, c;
+
+  if(row*col>argc-2) {
+    post("mtx_transpose: sparse matrices not yet supported : use \"mtx_check\"");
+    return;
+  }
+  if (col*row!=x->col*x->row) {
+    freebytes(x->atombuffer, (x->col*x->row+2)*sizeof(t_atom));
+    x->atombuffer = (t_atom *)getbytes((row*col+2)*sizeof(t_atom));
+  }
+  ap = x->atombuffer+2;
+  setdimen(x, col, row);
+  r = row;
+  while(r--){
+    c=col;
+    while(c--) {
+      t_float f = atom_getfloat(argv+r*col+c);
+      SETFLOAT(ap+c*row+r, f);
+    }
+  }
+    
+  matrix_bang(x);
+}
+
+static void *mtx_transpose_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_transpose_class);
+  outlet_new(&x->x_obj, 0);
+  x->col=x->row=0;
+  x->atombuffer=0;
+  return (x);
+}
+void mtx_transpose_setup(void)
+{
+  mtx_transpose_class = class_new(gensym("mtx_transpose"), (t_newmethod)mtx_transpose_new, 
+				  (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addbang  (mtx_transpose_class, matrix_bang);
+  class_addmethod(mtx_transpose_class, (t_method)mtx_transpose_matrix, gensym("matrix"), A_GIMME, 0);
+  class_sethelpsymbol(mtx_transpose_class, gensym("iemmatrix/mtx_transpose"));
+}
+
+void iemtx_transpose_setup(void){
+  mtx_transpose_setup();
+}
diff --git a/src/mtx_zeros.c b/src/mtx_zeros.c
new file mode 100644
index 0000000..a340967
--- /dev/null
+++ b/src/mtx_zeros.c
@@ -0,0 +1,56 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * (c) IOhannes m zmölnig, forum::für::umläute
+ * 
+ * IEM, Graz
+ *
+ * this code is published under the LGPL
+ *
+ */
+#include "iemmatrix.h"
+
+/* mtx_zeros */
+static t_class *mtx_zeros_class;
+static void *mtx_zeros_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_matrix *x = (t_matrix *)pd_new(mtx_zeros_class);
+  int col=0, row=0;
+  outlet_new(&x->x_obj, 0);
+  x->row = x->col = 0;
+  x->atombuffer   = 0;
+  switch(argc) {
+  case 0:
+    break;
+  case 1:
+    col=row=atom_getfloat(argv);
+    break;
+  default:
+    row=atom_getfloat(argv++);
+    col=atom_getfloat(argv);
+  }
+  if(col<0)col=0;
+  if(row<0)row=0;
+  if (col*row){
+    x->atombuffer = (t_atom *)getbytes((col*row+2)*sizeof(t_atom));
+    setdimen(x, row, col);
+    matrix_set(x, 0);
+  }
+  return (x);
+}
+void mtx_zeros_setup(void)
+{
+  mtx_zeros_class = class_new(gensym("mtx_zeros"), (t_newmethod)mtx_zeros_new, 
+			      (t_method)matrix_free, sizeof(t_matrix), 0, A_GIMME, 0);
+  class_addlist(mtx_zeros_class, matrix_zeros);
+  class_addbang(mtx_zeros_class, matrix_bang);
+  class_addmethod(mtx_zeros_class, (t_method)matrix_zeros, gensym("matrix"), A_GIMME, 0);
+
+  class_sethelpsymbol(mtx_zeros_class, gensym("iemmatrix/mtx_special"));
+}
+void iemmtx_zeros_setup(void){
+  mtx_zeros_setup();
+}