From 8b0873392ad0db55fdb9d0cdfc670366bc96a9c9 Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Mon, 26 Apr 2010 03:10:47 +0000 Subject: converted maxlib to use libdir template, in preparations for debianizing it svn path=/trunk/externals/maxlib/; revision=13476 --- poisson.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 poisson.c (limited to 'poisson.c') diff --git a/poisson.c b/poisson.c new file mode 100644 index 0000000..ce2e33b --- /dev/null +++ b/poisson.c @@ -0,0 +1,91 @@ +/* ---------------------------- rand_poisson ---------------------------------- */ +/* */ +/* rand_poisson generates a poisson 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 = "poisson v0.1, generates a poisson distributed random variable\n" + " written by Olaf Matthes "; + +/* -------------------------- rand_poisson ------------------------------ */ + +static t_class *rand_poisson_class; + +typedef struct _rand_poisson +{ + t_object x_obj; + t_float x_lambda; +} t_rand_poisson; + +static void *rand_poisson_new(t_floatarg f) +{ + t_rand_poisson *x = (t_rand_poisson *)pd_new(rand_poisson_class); + srand( (unsigned)time( NULL ) ); + floatinlet_new(&x->x_obj, &x->x_lambda); + outlet_new(&x->x_obj, &s_float); + x->x_lambda = f; + return (x); +} + +static void rand_poisson_bang(t_rand_poisson *x) +{ + t_float u, v; + t_int n = 0; + v = exp(-x->x_lambda); + u = fran(); + while(u > v) + { + u *= fran(); + n++; + } + outlet_float(x->x_obj.ob_outlet, n); +} + +#ifndef MAXLIB +void poisson_setup(void) +{ + rand_poisson_class = class_new(gensym("poisson"), (t_newmethod)rand_poisson_new, 0, + sizeof(t_rand_poisson), 0, A_DEFFLOAT, 0); + class_addbang(rand_poisson_class, rand_poisson_bang); + class_sethelpsymbol(rand_poisson_class, gensym("poisson-help.pd")); + post(version); +} +#else +void maxlib_poisson_setup(void) +{ + rand_poisson_class = class_new(gensym("maxlib_poisson"), (t_newmethod)rand_poisson_new, 0, + sizeof(t_rand_poisson), 0, A_DEFFLOAT, 0); + class_addcreator((t_newmethod)rand_poisson_new, gensym("poisson"), A_DEFFLOAT, 0); + class_addbang(rand_poisson_class, rand_poisson_bang); + class_sethelpsymbol(rand_poisson_class, gensym("maxlib/poisson-help.pd")); +} +#endif -- cgit v1.2.1