aboutsummaryrefslogtreecommitdiff
path: root/src/weibull.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/weibull.c')
-rw-r--r--src/weibull.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/src/weibull.c b/src/weibull.c
new file mode 100644
index 0000000..02b8a4e
--- /dev/null
+++ b/src/weibull.c
@@ -0,0 +1,85 @@
+/* ---------------------------- rand_weibull ---------------------------------- */
+/* */
+/* rand_weibull generates a weibull 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 = "weibull v0.1, generates a weibull distributed random variable\n"
+ " written by Olaf Matthes <olaf.matthes@gmx.de>";
+
+/* -------------------------- rand_weibull ------------------------------ */
+
+static t_class *rand_weibull_class;
+
+typedef struct _rand_weibull
+{
+ t_object x_obj;
+ t_float x_s;
+ t_float x_t;
+} t_rand_weibull;
+
+static void *rand_weibull_new(t_floatarg s, t_floatarg t)
+{
+ t_rand_weibull *x = (t_rand_weibull *)pd_new(rand_weibull_class);
+ srand( (unsigned)time( NULL ) );
+ floatinlet_new(&x->x_obj, &x->x_s);
+ floatinlet_new(&x->x_obj, &x->x_t);
+ outlet_new(&x->x_obj, &s_float);
+ x->x_s = s;
+ x->x_t = t;
+ return (x);
+}
+
+static void rand_weibull_bang(t_rand_weibull *x)
+{
+ t_float u, a, t, tinv;
+ t = (x->x_t <= 0 ? 0.0001 : x->x_t);
+ tinv = 1/t;
+ do
+ {
+ u = fran();
+ }
+ while(u == 0 || u == 1);
+ a = 1/(1 - u);
+ outlet_float(x->x_obj.ob_outlet, x->x_s*pow(log(a), tinv));
+}
+
+void weibull_setup(void)
+{
+ rand_weibull_class = class_new(gensym("weibull"), (t_newmethod)rand_weibull_new, 0,
+ sizeof(t_rand_weibull), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addbang(rand_weibull_class, rand_weibull_bang);
+ class_sethelpsymbol(rand_weibull_class, gensym("maxlib/help-weibull.pd"));
+#ifndef MAXLIB
+ post(version);
+#endif
+}