From f9920590bc711f8a6aee5d71348c8ef6b42bed70 Mon Sep 17 00:00:00 2001 From: "B. Bogart" Date: Tue, 30 Sep 2003 16:06:46 +0000 Subject: again, I missed a few. This should now be complete! svn path=/trunk/externals/bbogart/chaos/; revision=1053 --- logistic.c | 247 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 247 insertions(+) create mode 100644 logistic.c (limited to 'logistic.c') diff --git a/logistic.c b/logistic.c new file mode 100644 index 0000000..509bfb3 --- /dev/null +++ b/logistic.c @@ -0,0 +1,247 @@ +/* logistic Attractor PD External */ +/* Copyright Michael McGonagle, from ??????, 2003 */ +/* This program is distributed under the params of the GNU Public License */ + +/////////////////////////////////////////////////////////////////////////////////// +/* This file is part of Chaos PD Externals. */ +/* */ +/* Chaos PD Externals are free software; you can redistribute them and/or modify */ +/* them 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. */ +/* */ +/* Chaos PD Externals are distributed in the hope that they 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 the Chaos PD Externals; if not, write to the Free Software */ +/* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +/////////////////////////////////////////////////////////////////////////////////// + +#include +#include +#include +#include +#include "lyapunov.h" + +#define M_a_lo 0 +#define M_a_hi 4 + +#define M_a 0 + +#define M_x 0 + +#define M_param_count 1 +#define M_var_count 1 +#define M_search_count 3 +#define M_failure_limit 1000 + +static char *version = "logistic v0.0, by Michael McGonagle, from ??????, 2003"; + +t_class *logistic_class; + +typedef struct logistic_struct { + t_object x_obj; + + double vars[M_var_count]; + double vars_init[M_var_count]; + t_atom vars_out[M_var_count]; + t_outlet *vars_outlet; + + t_atom search_out[M_search_count]; + t_outlet *search_outlet; + + double a, a_lo, a_hi; + t_atom params_out[M_param_count]; + t_outlet *params_outlet; + double lyap_exp, lyap_lo, lyap_hi, lyap_limit, failure_ratio; +} logistic_struct; + +static void calc(logistic_struct *logistic, double *vars) { + double x_0; + x_0 =logistic -> a*vars[M_x]*(1.0-vars[M_x]); + vars[M_x] = x_0; +} // end calc + +static void calculate(logistic_struct *logistic) { + calc(logistic, logistic -> vars); + outlet_float(logistic -> x_obj.ob_outlet, logistic -> vars[M_x]); +} // end calculate + +static void reset(logistic_struct *logistic, t_symbol *s, int argc, t_atom *argv) { + if (argc == M_var_count) { + logistic -> vars[M_x] = (double) atom_getfloatarg(M_x, argc, argv); + } else { + logistic -> vars[M_x] = logistic -> vars_init[M_x]; + } // end if +} // end reset + +static char *classify(logistic_struct *logistic) { + static char buff[2]; + char *c = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; + buff[0] = c[(int) (((logistic -> a - M_a_lo) * (1.0 / (M_a_hi - M_a_lo))) * 26)]; + buff[1] = '\0'; + return buff; +} + +static void make_results(logistic_struct *logistic) { + SETFLOAT(&logistic -> search_out[0], logistic -> lyap_exp); + SETSYMBOL(&logistic -> search_out[1], gensym(classify(logistic))); + SETFLOAT(&logistic -> search_out[2], logistic -> failure_ratio); + SETFLOAT(&logistic -> vars_out[M_x], logistic -> vars[M_x]); + SETFLOAT(&logistic -> params_out[M_a], logistic -> a); + outlet_list(logistic -> params_outlet, gensym("list"), M_param_count, logistic -> params_out); + outlet_list(logistic -> vars_outlet, gensym("list"), M_var_count, logistic -> vars_out); +} + +static void show(logistic_struct *logistic) { + make_results(logistic); + outlet_anything(logistic -> search_outlet, gensym("show"), M_search_count, logistic -> search_out); +} + +static void param(logistic_struct *logistic, t_symbol *s, int argc, t_atom *argv) { + if (argc != 1) { + post("Incorrect number of arguments for logistic fractal. Expecting 1 arguments."); + return; + } + logistic -> a = (double) atom_getfloatarg(0, argc, argv); +} + +static void seed(logistic_struct *logistic, t_symbol *s, int argc, t_atom *argv) { + if (argc > 0) { + srand48(((unsigned int)time(0))|1); + } else { + srand48((unsigned int) atom_getfloatarg(0, argc, argv)); + } +} + +static void lyap(logistic_struct *logistic, t_floatarg l, t_floatarg h, t_floatarg lim) { + logistic -> lyap_lo = l; + logistic -> lyap_hi = h; + logistic -> lyap_limit = (double) ((int) lim); +} + +static void elyap(logistic_struct *logistic) { + double results[M_var_count]; + int i; + if (lyapunov_full((void *) logistic, (t_gotfn) calc, M_var_count, logistic -> vars, results) != NULL) { + post("elyapunov:"); + for(i = 0; i < M_var_count; i++) { post("%d: %3.80f", i, results[i]); } + } +} + +static void limiter(logistic_struct *logistic) { + if (logistic -> a_lo < M_a_lo) { logistic -> a_lo = M_a_lo; } + if (logistic -> a_lo > M_a_hi) { logistic -> a_lo = M_a_hi; } + if (logistic -> a_hi < M_a_lo) { logistic -> a_hi = M_a_lo; } + if (logistic -> a_hi > M_a_hi) { logistic -> a_hi = M_a_hi; } +} + +static void constrain(logistic_struct *logistic, t_symbol *s, int argc, t_atom *argv) { + int i; + t_atom *arg = argv; + if (argc == 0) { + // reset to full limits of search ranges + logistic -> a_lo = M_a_lo; + logistic -> a_hi = M_a_hi; + return; + } + if (argc == 1) { + // set the ranges based on percentage of full range + double percent = atom_getfloat(arg); + double a_spread = ((M_a_hi - M_a_lo) * percent) / 2; + logistic -> a_lo = logistic -> a - a_spread; + logistic -> a_hi = logistic -> a + a_spread; + limiter(logistic); + return; + } + if (argc != M_param_count * 2) { + post("Invalid number of arguments for logistic constraints, requires 2 values, got %d", argc); + return; + } + logistic -> a_lo = atom_getfloat(arg++); + logistic -> a_hi = atom_getfloat(arg++); + limiter(logistic); +} + +static void search(logistic_struct *logistic, t_symbol *s, int argc, t_atom *argv) { + int not_found, not_expired = logistic -> lyap_limit; + int jump, i, iterations; + t_atom vars[M_var_count]; + double temp_a = logistic -> a; + if (argc > 0) { + for (i = 0; i < M_var_count; i++) { + SETFLOAT(&vars[i], atom_getfloatarg(i, argc, argv)); + } + } else { + for (i = 0; i < M_var_count; i++) { + SETFLOAT(&vars[i], logistic -> vars_init[i]); + } + } + do { + jump = 500; + not_found = 0; + iterations = 10000; + bad_params: + logistic -> a = (drand48() * (logistic -> a_hi - logistic -> a_lo)) + logistic -> a_lo; + // put any preliminary checks specific to this fractal to eliminate bad_params + + reset(logistic, NULL, argc, vars); + do { calc(logistic, logistic -> vars); } while(jump--); + logistic -> lyap_exp = lyapunov((void *) logistic, (t_gotfn) calc, M_var_count, (double *) logistic -> vars); + if (isnan(logistic -> lyap_exp)) { not_found = 1; } + if (logistic -> lyap_exp < logistic -> lyap_lo || logistic -> lyap_exp > logistic -> lyap_hi) { not_found = 1; } + not_expired--; + } while(not_found && not_expired); + reset(logistic, NULL, argc, vars); + if (!not_expired) { + post("Could not find a fractal after %d attempts.", (int) logistic -> lyap_limit); + post("Try using wider constraints."); + logistic -> a = temp_a; + outlet_anything(logistic -> search_outlet, gensym("invalid"), 0, NULL); + } else { + logistic -> failure_ratio = (logistic -> lyap_limit - not_expired) / logistic -> lyap_limit; + make_results(logistic); + outlet_anything(logistic -> search_outlet, gensym("search"), M_search_count, logistic -> search_out); + } +} + +void *logistic_new(t_symbol *s, int argc, t_atom *argv) { + logistic_struct *logistic = (logistic_struct *) pd_new(logistic_class); + if (logistic != NULL) { + outlet_new(&logistic -> x_obj, &s_float); + logistic -> search_outlet = outlet_new(&logistic -> x_obj, &s_list); + logistic -> vars_outlet = outlet_new(&logistic -> x_obj, &s_list); + logistic -> params_outlet = outlet_new(&logistic -> x_obj, &s_list); + if (argc == M_param_count + M_var_count) { + logistic -> vars_init[M_x] = logistic -> vars[M_x] = (double) atom_getfloatarg(0, argc, argv); + logistic -> a = (double) atom_getfloatarg(1, argc, argv); + } else { + if (argc != 0 && argc != M_param_count + M_var_count) { + post("Incorrect number of arguments for logistic fractal. Expecting 2 arguments."); + } + logistic -> vars_init[M_x] = 0.1; + logistic -> a = 4; + } + constrain(logistic, NULL, 0, NULL); + lyap(logistic, -1000000.0, 1000000.0, M_failure_limit); + } + return (void *)logistic; +} + +void logistic_setup(void) { + logistic_class = class_new(gensym("logistic"), (t_newmethod) logistic_new, 0, sizeof(logistic_struct), 0, A_GIMME, 0); + class_addbang(logistic_class, (t_method) calculate); + class_addmethod(logistic_class, (t_method) reset, gensym("reset"), A_GIMME, 0); + class_addmethod(logistic_class, (t_method) show, gensym("show"), 0); + class_addmethod(logistic_class, (t_method) param, gensym("param"), A_GIMME, 0); + class_addmethod(logistic_class, (t_method) seed, gensym("seed"), A_GIMME, 0); + class_addmethod(logistic_class, (t_method) lyap, gensym("lyapunov"), A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0); + class_addmethod(logistic_class, (t_method) elyap, gensym("elyapunov"), 0); + class_addmethod(logistic_class, (t_method) search, gensym("search"), A_GIMME, 0); + class_addmethod(logistic_class, (t_method) constrain, gensym("constrain"), A_GIMME, 0); + class_sethelpsymbol(logistic_class, gensym("help-logistic.pd")); +} + -- cgit v1.2.1