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

1 files changed, 680 insertions, 0 deletions

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();
+}