diff options
| author | Hans-Christoph Steiner <eighthave@users.sourceforge.net> | 2010-04-26 03:10:47 +0000 |
|---|---|---|
| committer | IOhannes m zmölnig <zmoelnig@iem.at> | 2015-10-14 13:53:22 +0200 |
| commit | 8b0873392ad0db55fdb9d0cdfc670366bc96a9c9 (patch) | |
| tree | dfc09d2f2d60aac05d656906c3729348344da9d7 /beta.c | |
| parent | 534b4462f8efc240b8b3d76d56613f38d9a9fef4 (diff) | |
converted maxlib to use libdir template, in preparations for debianizing it
svn path=/trunk/externals/maxlib/; revision=13476
Diffstat (limited to 'beta.c')
| -rw-r--r-- | beta.c | 107 |
1 files changed, 107 insertions, 0 deletions
@@ -0,0 +1,107 @@ +/* ---------------------------- rand_beta ------------------------------------- */
+/* */
+/* rand_beta generates a beta 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 = "beta v0.1, generates a beta distributed random variable\n"
+ " written by Olaf Matthes <olaf.matthes@gmx.de>";
+
+/* -------------------------- rand_beta ------------------------------ */
+
+static t_class *rand_beta_class;
+
+typedef struct _rand_beta
+{
+ t_object x_obj;
+ t_float x_a;
+ t_float x_b;
+} t_rand_beta;
+
+static void *rand_beta_new(t_floatarg a, t_floatarg b)
+{
+ t_rand_beta *x = (t_rand_beta *)pd_new(rand_beta_class);
+ srand( (unsigned)time( NULL ) );
+ floatinlet_new(&x->x_obj, &x->x_a);
+ floatinlet_new(&x->x_obj, &x->x_b);
+ outlet_new(&x->x_obj, &s_float);
+ x->x_a = a;
+ x->x_b = b;
+ return (x);
+}
+
+static void rand_beta_bang(t_rand_beta *x)
+{
+ t_float u1, u2, y01, y2, sum, a, b, ainv, binv;
+ a = (x->x_a <= 0 ? 0.0001 : x->x_a);
+ b = (x->x_b <= 0 ? 0.0001 : x->x_b);
+ ainv = 1/a;
+ binv = 1/b;
+ do
+ {
+ do
+ {
+ u1 = fran();
+ }
+ while(u1 == 0);
+ do
+ {
+ u2 = fran();
+ }
+ while(u2 == 0);
+ y01 = pow(u1, ainv);
+ y2 = pow(u2, binv);
+ sum = y01 + y2;
+ }
+ while(sum > 1);
+ outlet_float(x->x_obj.ob_outlet, y01/sum);
+}
+
+#ifndef MAXLIB
+void beta_setup(void)
+{
+ rand_beta_class = class_new(gensym("beta"), (t_newmethod)rand_beta_new, 0,
+ sizeof(t_rand_beta), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addbang(rand_beta_class, rand_beta_bang);
+ class_sethelpsymbol(rand_beta_class, gensym("beta-help.pd"));
+ post(version);
+}
+#else
+void maxlib_beta_setup(void)
+{
+ rand_beta_class = class_new(gensym("maxlib_beta"), (t_newmethod)rand_beta_new, 0,
+ sizeof(t_rand_beta), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addbang(rand_beta_class, rand_beta_bang);
+ class_addcreator((t_newmethod)rand_beta_new, gensym("beta"), A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_sethelpsymbol(rand_beta_class, gensym("maxlib/beta-help.pd"));
+}
+#endif
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