359 lines
9.9 KiB
C
359 lines
9.9 KiB
C
/* lil-gp Genetic Programming System, version 1.0, 11 July 1995
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* Copyright (C) 1995 Michigan State University
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Douglas Zongker (zongker@isl.cps.msu.edu)
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* Dr. Bill Punch (punch@isl.cps.msu.edu)
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*
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* Computer Science Department
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* A-714 Wells Hall
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* Michigan State University
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* East Lansing, Michigan 48824
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* USA
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*
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*/
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#include <lilgp.h>
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/* the table of operator names and initialization functions. extend this
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* table whenever you add a new operator. {NULL,NULL} marks the end of
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* the table.
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*/
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extern int quietmode;
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gp_operator operator_table[] =
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{{"crossover", operator_crossover_init},
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{"reproduction", operator_reproduce_init},
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{"mutation", operator_mutate_init},
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{NULL, NULL}};
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/* change_population()
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*
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* breed the new population.
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*/
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population* change_population(population* oldpop, breedphase* bp)
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{
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population* newpop;
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int i, j;
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int numphases;
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double totalrate = 0.0;
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double r, r2;
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int prob_oper = atoi(get_parameter("probabilistic_operators"));
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/* allocate the new population. */
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newpop = allocate_population(oldpop->size);
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/* the first element of the breedphase table is a dummy -- its
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operator field stores the number of phases. */
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numphases = bp[0].gp_operator;
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/* call the start method for each phase. */
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for (i = 1; i <= numphases; ++i)
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{
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totalrate += bp[i].rate;
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if (bp[i].operator_start)
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bp[i].operator_start(oldpop, bp[i].data);
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}
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select_context_func_ptr select_con = get_select_context("best");
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struct _sel_context* context = select_con(SELECT_INIT, NULL, oldpop, "best");
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char* elitism_str = get_parameter("elitism");
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if (elitism_str == NULL)
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elitism_str = "0";
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int elitism = atoi(elitism_str);
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if (elitism < 0)
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error(E_FATAL_ERROR, "elitism must be >= 0");
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for (i = 0; i < elitism; i++)
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{
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/* select an individual... */
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j = context->select_method(context);
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/* ...and reproduce it into the new population. */
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duplicate_individual((newpop->ind) + newpop->next, (oldpop->ind) + j);
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newpop->ind[newpop->next].flags = FLAG_NONE;
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++newpop->next;
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if (test_detail_level(50) && !quietmode)
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printf("\tEliting a new pop!\n");
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}
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typedef struct
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{
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int next;
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int *list;
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} bestworst_data;
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FREE(((bestworst_data*) context->data)->list);
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FREE(context->data);
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FREE(context);
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/* now fill the new population. */
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while (newpop->next < newpop->size)
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{
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/** select an operator, either stochastically or not depending on
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the probabilistic_operators parameter. **/
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if (prob_oper)
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r = totalrate * random_double(&globrand);
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else
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r = totalrate * ((double) newpop->next / (double) newpop->size);
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r2 = bp[1].rate;
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for (i = 1; r2 < r;)
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r2 += bp[++i].rate;
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#ifdef DEBUG
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fprintf ( stderr, "picked %10.3lf; operator %d\n", r, i );
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#endif
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/* call the phase's method to do the operation. */
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if (bp[i].operator_operate)
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bp[i].operator_operate(oldpop, newpop, bp[i].data);
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}
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/* call each phase's method to do cleanup. */
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for (i = 1; i <= numphases; ++i)
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{
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if (bp[i].operator_end)
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bp[i].operator_end(bp[i].data);
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}
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/* mark all the ERCs referenced in the new population. */
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for (i = 0; i < newpop->size; ++i)
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for (j = 0; j < tree_count; ++j)
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reference_ephem_constants(newpop->ind[i].tr[j].data, 1);
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/* free the old population. */
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free_population(oldpop);
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return (newpop);
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}
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/* free_breeding()
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*
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* this frees the breedphase table for each subpopulation.
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*/
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void free_breeding(multipop* mpop)
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{
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int i;
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for (i = 0; i < mpop->size; ++i)
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{
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free_one_breeding(mpop->bpt[i]);
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FREE(mpop->bpt[i]);
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}
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FREE(mpop->bpt);
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mpop->bpt = NULL;
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}
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/* free_one_breeding()
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*
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* this frees the breedphase table for a single subpopulation.
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*/
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void free_one_breeding(breedphase* bp)
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{
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int i;
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for (i = 1; i <= bp[0].gp_operator; ++i)
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{
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if (bp[i].operator_free)
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bp[i].operator_free(bp[i].data);
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}
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}
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/* initialize_breeding()
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*
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* this builds the breedphase table for each subpopulation.
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*/
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void initialize_breeding(multipop* mpop)
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{
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char pnamebuf[100];
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int i;
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mpop->bpt = (breedphase**) MALLOC(mpop->size * sizeof(breedphase*));
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for (i = 0; i < mpop->size; ++i)
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{
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sprintf(pnamebuf, "subpop[%d].", i + 1);
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mpop->bpt[i] = initialize_one_breeding(pnamebuf);
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}
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}
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/* initialize_one_breeding()
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*
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* this builds the breedphase table for a single subpopulation. */
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breedphase* initialize_one_breeding(char* prefix)
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{
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char pnamebuf[100];
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char* param, * param2;
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int i, j;
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double rate;
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int errors = 0;
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breedphase* bp;
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gp_operator* op;
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char* name, * namep;
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/* get the number of phases. */
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param = get_breed_parameter(prefix, "breed_phases");
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if (param == NULL)
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error(E_FATAL_ERROR, "no value specified for \"%sbreed_phases\".",
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prefix);
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j = atoi(param);
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if (j <= 0)
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error(E_FATAL_ERROR,
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"\"%sbreed_phases\" must be greater than zero.", prefix);
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/* the first record of the table is a dummy -- its operator field
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contains the number of phases. */
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bp = (breedphase*) MALLOC((j + 1) * sizeof(breedphase));
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bp[0].gp_operator = j;
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bp[0].rate = 0.0;
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bp[0].operator_start = NULL;
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bp[0].operator_end = NULL;
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bp[0].operator_free = NULL;
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bp[0].operator_operate = NULL;
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/* for each phase... */
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for (i = 0; i < j; ++i)
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{
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bp[i + 1].operator_start = NULL;
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bp[i + 1].operator_end = NULL;
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bp[i + 1].operator_free = NULL;
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bp[i + 1].operator_operate = NULL;
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/* get the operator string (name and options) */
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param = get_breed_parameter(prefix, "breed[%d].operator", i + 1);
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if (param == NULL)
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{
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++errors;
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error(E_ERROR,
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"no value specifed for \"%sbreed[%d].operator\".",
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prefix, i + 1);
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continue;
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}
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/* isolate the name portion of the string. */
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name = (char*) MALLOC((strlen(param) + 1) * sizeof(char));
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namep = name;
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for (param2 = param, namep = name;
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*param2 && *param2 != ',' && *param2 != '\n';
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++param2)
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if (!isspace(*param2))
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*(namep++) = *param2;
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*namep = 0;
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if (!*param2)
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--param2;
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/* look up the name in the table of operators. */
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op = operator_table;
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while (op->name)
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{
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if (strcmp(op->name, name) == 0)
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break;
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++op;
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}
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FREE(name);
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if (op->name)
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/* call the operator's initialization function to fill in the fields
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of the table for this phase. */
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errors += op->func(param2 + 1, bp + i + 1);
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else
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/* the specified operator is not in the table. */
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error(E_FATAL_ERROR,
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"%s: \"%s\" is not a known operator.", pnamebuf, param);
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/* get the rate for this phase. */
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param = get_breed_parameter(prefix, "breed[%d].rate", i + 1);
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if (param == NULL)
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{
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++errors;
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error(E_ERROR,
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"no value specified for \"%sbreed[%d].rate\".",
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prefix, i + 1);
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} else
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{
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rate = strtod(param, NULL);
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if (rate < 0.0)
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{
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++errors;
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error(E_FATAL_ERROR,
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"\"%sbreed[%d].rate\" must be nonnegative.",
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prefix, i + 1);
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} else if (rate == 0.0)
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{
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error(E_WARNING,
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"\"%sbreed[%d].rate\" is zero; is this correct?",
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prefix, i + 1);
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}
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bp[i + 1].rate = rate;
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}
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}
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/* if any errors occurred, stop now. */
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if (errors)
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error(E_FATAL_ERROR, "Errors have occurred, aborting.");
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return bp;
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}
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/* rebuild_breeding()
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*
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* rebuilds the breeding table from the parameter database. called from
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* user code when the breeding parameters change mid-run.
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*/
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void rebuild_breeding(multipop* mpop)
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{
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free_breeding(mpop);
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initialize_breeding(mpop);
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}
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/* get_breed_parameter()
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*
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* format and following arguments are passed to sprintf to form a string.
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* looks for a parameter called "<prefix><string>", and returns its value.
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* if it does not exist, returns the value of a parameter called "<string>".
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*/
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char* get_breed_parameter(char* prefix, char* format, ...)
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{
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char* param;
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static char pnamebuf[200];
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int len = strlen(prefix);
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va_list ap;
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strcpy(pnamebuf, prefix);
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va_start (ap, format);
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vsprintf(pnamebuf + len, format, ap);
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va_end (ap);
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param = get_parameter(pnamebuf);
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if (param == NULL)
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return get_parameter(pnamebuf + len);
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else
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return param;
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}
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