diff options
Diffstat (limited to 'cauchy.c')
| -rw-r--r-- | cauchy.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/cauchy.c b/cauchy.c new file mode 100644 index 0000000..ee64296 --- /dev/null +++ b/cauchy.c @@ -0,0 +1,89 @@ +/* ---------------------------- rand_cauchy ----------------------------------- */
+/* */
+/* rand_cauchy generates a Cauchy distributed random variable. */
+/* Written by Olaf Matthes (olaf.matthes@gmx.de) */
+/* Based on code found in Dodge/Jerse "Computer Music" */
+/* Get source at http://www.akustische-kunst.org/puredata/maxlib/ */
+/* */
+/* This program is free software; you can redistribute it and/or */
+/* modify it under the terms of the GNU General Public License */
+/* as published by the Free Software Foundation; either version 2 */
+/* of the License, or (at your option) any later version. */
+/* */
+/* This program is distributed in the hope that it will be useful, */
+/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
+/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
+/* GNU General Public License for more details. */
+/* */
+/* You should have received a copy of the GNU General Public License */
+/* along with this program; if not, write to the Free Software */
+/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+/* */
+/* Based on PureData by Miller Puckette and others. */
+/* */
+/* ---------------------------------------------------------------------------- */
+ +#include "m_pd.h" +#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+
+#define fran() (t_float)rand()/(t_float)RAND_MAX
+#ifndef M_PI
+#define M_PI 3.1415927
+#endif
+ +static char *version = "cauchy v0.1, generates a Cauchy distributed random variable\n"
+ " with a spread governed by to parameter 'aplha',\n"
+ " written by Olaf Matthes <olaf.matthes@gmx.de>";
+ +/* -------------------------- rand_cauchy ------------------------------ */
+
+static t_class *rand_cauchy_class;
+
+typedef struct _rand_cauchy
+{
+ t_object x_obj;
+ t_float x_alpha;
+} t_rand_cauchy;
+
+static void *rand_cauchy_new(t_floatarg f)
+{
+ t_rand_cauchy *x = (t_rand_cauchy *)pd_new(rand_cauchy_class);
+ srand( (unsigned)time( NULL ) );
+ floatinlet_new(&x->x_obj, &x->x_alpha);
+ outlet_new(&x->x_obj, &s_float);
+ x->x_alpha = f;
+ return (x);
+}
+
+static void rand_cauchy_bang(t_rand_cauchy *x)
+{
+ t_float u;
+ do
+ {
+ u = fran();
+ }
+ while(u == 0.5);
+ u *= M_PI;
+ outlet_float(x->x_obj.ob_outlet, x->x_alpha*tan(u));
+}
+
+#ifndef MAXLIB
+void cauchy_setup(void)
+{
+ rand_cauchy_class = class_new(gensym("cauchy"), (t_newmethod)rand_cauchy_new, 0,
+ sizeof(t_rand_cauchy), 0, A_DEFFLOAT, 0);
+ class_addbang(rand_cauchy_class, rand_cauchy_bang);
+ class_sethelpsymbol(rand_cauchy_class, gensym("cauchy-help.pd"));
+ post(version);
+#else
+void maxlib_cauchy_setup(void)
+{
+ rand_cauchy_class = class_new(gensym("maxlib_cauchy"), (t_newmethod)rand_cauchy_new, 0,
+ sizeof(t_rand_cauchy), 0, A_DEFFLOAT, 0);
+ class_addbang(rand_cauchy_class, rand_cauchy_bang);
+ class_addcreator((t_newmethod)rand_cauchy_new, gensym("cauchy"), A_DEFFLOAT, 0);
+ class_sethelpsymbol(rand_cauchy_class, gensym("maxlib/cauchy-help.pd"));
+#endif
+}
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