1 files changed, 92 insertions, 0 deletions
diff --git a/src/mtx_dbtopow.c b/src/mtx_dbtopow.c
new file mode 100644
index 0000000..237c5ea
--- /dev/null
+++ b/src/mtx_dbtopow.c
@@ -0,0 +1,92 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  mostly refering to matlab/octave matrix functions
+ *
+ * Copyright (c) IOhannes m zmölnig, forum::für::umläute
+ * IEM, Graz, Austria
+ *
+ * For information on usage and redistribution, and for a DISCLAIMER OF ALL
+ * WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+ *
+ */
+#include "iemmatrix.h"
+
+#define LOGTEN 2.302585092994
+
+/* mtx_dbtopow: B=log(A); B[n,m]=e^A[n,m]  */
+
+static t_class *mtx_dbtopow_class;
+
+static void mtx_dbtopow_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;
+  int n = argc-2;
+
+  if (argc<2){    post("mtx_dbtopow: crippled matrix");    return;  }
+  if ((col<1)||(row<1)) {    post("mtx_dbtopow: invalid dimensions");    return;  }
+  if (col*row>argc-2){    post("sparse matrix not yet supported : use \"mtx_check\"");    return;  }
+
+  adjustsize(&x->m, row, col);
+  m =  x->m.atombuffer+2;
+
+  while(n--){
+    t_float f=atom_getfloat(argv++);
+    t_float v=0;
+    f=(f>485)?485:f;
+    v=(f<=0)?0:exp((LOGTEN*0.1) * (f-100.));
+    SETFLOAT(m, (v<0)?0:v);
+    m++;
+  }
+
+  outlet_anything(x->x_obj.ob_outlet, gensym("matrix"), argc, x->m.atombuffer);
+}
+
+static void mtx_dbtopow_list(t_mtx_binscalar *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int n=argc;
+  t_atom *m;
+
+  adjustsize(&x->m, 1, argc);
+  m = x->m.atombuffer;
+
+  while(n--){
+    t_float f=atom_getfloat(argv++);
+    t_float v=0;
+    f=(f>485)?485:f;
+    v=(f<=0)?0:exp((LOGTEN*0.1) * (f-100.));
+    SETFLOAT(m, (v<0)?0:v);
+    m++;
+  }
+
+  outlet_list(x->x_obj.ob_outlet, gensym("list"), argc, x->m.atombuffer);
+}
+
+static void *mtx_dbtopow_new(t_symbol *s)
+{
+  /* element log */
+  t_matrix *x = (t_matrix *)pd_new(mtx_dbtopow_class);
+  outlet_new(&x->x_obj, 0);
+  x->col = x->row = 0;
+  x->atombuffer = 0;
+  return(x);
+}
+
+void mtx_dbtopow_setup(void)
+{
+  mtx_dbtopow_class = class_new(gensym("mtx_dbtopow"), (t_newmethod)mtx_dbtopow_new, (t_method)mtx_binmtx_free,
+				   sizeof(t_mtx_binmtx), 0, A_GIMME, 0);
+  class_addmethod(mtx_dbtopow_class, (t_method)mtx_dbtopow_matrix, gensym("matrix"), A_GIMME, 0);
+  class_addlist  (mtx_dbtopow_class, mtx_dbtopow_list);
+  class_addbang  (mtx_dbtopow_class, mtx_binmtx_bang);
+
+
+}
+
+void iemtx_dbtopow_setup(void)
+{
+  mtx_dbtopow_setup();
+}