diff options
Diffstat (limited to 'beta.c')
-rw-r--r-- | beta.c | 214 |
1 files changed, 107 insertions, 107 deletions
@@ -1,107 +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
+/* ---------------------------- 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")); + logpost(NULL, 4, 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 |