From d41e58e6cd71fdacdca69ba78c29d42dc7d330d5 Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Wed, 20 Nov 2002 17:46:33 +0000 Subject: This commit was generated by cvs2svn to compensate for changes in r224, which included commits to RCS files with non-trunk default branches. svn path=/trunk/externals/maxlib/; revision=225 --- src/weibull.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 src/weibull.c (limited to 'src/weibull.c') 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 +#include +#include + +#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 "; + +/* -------------------------- 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 +} -- cgit v1.2.1