533 lines
16 KiB
C
533 lines
16 KiB
C
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/* 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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typedef struct
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{
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int keep_trying;
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int num_times; /* Number of times we should keep trying. If 0, infinity. --Sean */
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double internal;
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double external;
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double *tree;
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double treetotal;
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char *sname;
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sel_context *sc;
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int method;
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int mindepth, maxdepth;
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} mutate_data;
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/* operator_mutate_init()
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*
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* initialize a breedphase record for mutation. much of this is cut and
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* paste from the crossover operator; see that for (a few) more comments.
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*/
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int operator_mutate_init ( char *options, breedphase *bp )
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{
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int errors = 0;
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mutate_data *md;
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int i, j, k, m;
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double r;
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char **argv, **targv;
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int internalset = 0, externalset = 0;
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char *cp;
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md = (mutate_data *)MALLOC ( sizeof ( mutate_data ) );
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/* fill in the breedphase record. */
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bp->gp_operator = OPERATOR_MUTATE;
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bp->data = (void *)md;
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bp->operator_free = operator_mutate_free;
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bp->operator_start = operator_mutate_start;
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bp->operator_end = operator_mutate_end;
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bp->operator_operate = operator_mutate;
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/* default values for the mutation-specific data structure. */
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md->keep_trying = 0;
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md->internal = 0.9;
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md->external = 0.1;
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md->tree = (double *)MALLOC ( tree_count * sizeof ( double ) );
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for ( j = 0; j < tree_count; ++j )
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md->tree[j] = 0.0;
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md->treetotal = 0.0;
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md->sname = NULL;
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md->method = GENERATE_HALF_AND_HALF;
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md->mindepth = -1;
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md->maxdepth = -1;
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j = parse_o_rama ( options, &argv );
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for ( i = 0; i < j; ++i )
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{
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if ( strcmp ( "keep_trying", argv[i] ) == 0 )
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{
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md->keep_trying = translate_binary ( argv[++i] );
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if ( md->keep_trying == -1 )
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{
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++errors;
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error ( E_ERROR, "mutation: \"%s\" is not a valid setting for \"keep_trying\".",
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argv[i] );
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}
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}
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/* parse number of times to try */
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else if (strcmp ("num_times", argv[i]) == 0)
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{
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md->num_times = translate_binary(argv[++i]);
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if (md->num_times < 0 )
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{
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++errors;
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error ( E_ERROR, "mutation: \"%s\" is not a valid setting for \"num_times\".",
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argv[i] );
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}
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}
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else if ( strcmp ( "internal", argv[i] ) == 0 )
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{
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internalset = 1;
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md->internal = strtod ( argv[++i], NULL );
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if ( md->internal < 0.0 )
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{
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++errors;
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error ( E_ERROR, "mutation: \"internal\" must be nonnegative." );
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}
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}
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else if ( strcmp ( "external", argv[i] ) == 0 )
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{
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externalset = 1;
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md->external = strtod ( argv[++i], NULL );
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if ( md->external < 0.0 )
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{
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++errors;
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error ( E_ERROR, "mutation: \"external\" must be nonnegative." );
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}
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}
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else if ( strcmp ( "select", argv[i] ) == 0 )
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{
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if ( !exists_select_method ( argv[++i] ) )
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{
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++errors;
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error ( E_ERROR, "mutation: \"%s\" is not a known selection method.",
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argv[i] );
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}
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FREE ( md->sname );
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md->sname = (char *)MALLOC ( (strlen(argv[i])+1) * sizeof ( char ) );
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strcpy ( md->sname, argv[i] );
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}
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else if ( strcmp ( "method", argv[i] ) == 0 )
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{
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++i;
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if ( strcmp ( argv[i], "half_and_half" ) == 0 )
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md->method = GENERATE_HALF_AND_HALF;
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else if ( strcmp ( argv[i], "grow" ) == 0 )
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md->method = GENERATE_GROW;
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else if ( strcmp ( argv[i], "full" ) == 0 )
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md->method = GENERATE_FULL;
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else
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{
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++errors;
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error ( E_ERROR, "mutation: \"%s\" is not a known generation method.",
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argv[i] );
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}
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}
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else if ( strcmp ( "depth", argv[i] ) == 0 )
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{
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md->mindepth = strtol ( argv[++i], &cp, 10 );
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if ( *cp == 0 )
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md->maxdepth = md->mindepth;
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else if ( *cp == '-' )
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{
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md->maxdepth = strtol ( cp+1, &cp, 10 );
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if ( *cp )
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{
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++errors;
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error ( E_ERROR, "mutation: malformed depth string \"%s\".",
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argv[i] );
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}
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}
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else
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{
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++errors;
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error ( E_ERROR, "mutation: malformed depth string \"%s\".",
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argv[i] );
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}
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}
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else if ( strcmp ( "tree", argv[i] ) == 0 )
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{
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k = parse_o_rama ( argv[++i], &targv );
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if ( k != tree_count )
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{
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++errors;
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error ( E_ERROR, "mutation: wrong number of tree fields: \"%s\".",
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argv[i] );
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}
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else
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{
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for ( m = 0; m < k; ++m )
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{
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md->tree[m] = strtod ( targv[m], &cp );
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if ( *cp )
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{
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++errors;
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error ( E_ERROR, "mutation: \"%s\" is not a number.",
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targv[m] );
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}
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}
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}
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free_o_rama ( k, &targv );
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}
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else if ( strncmp ( "tree", argv[i], 4 ) == 0 )
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{
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k = strtol ( argv[i]+4, &cp, 10 );
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if ( *cp )
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{
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++errors;
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error ( E_ERROR, "mutation: unknown option \"%s\".",
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argv[i] );
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}
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if ( k < 0 || k >= tree_count )
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{
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++errors;
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error ( E_ERROR, "mutation: \"%s\" is out of range.",
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argv[i] );
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}
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else
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{
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md->tree[k] = strtod ( argv[++i], &cp );
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if ( *cp )
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{
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++errors;
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error ( E_ERROR, "mutation: \"%s\" is not a number.",
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argv[i] );
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}
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}
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}
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else
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{
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++errors;
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error ( E_ERROR, "mutation: unknown option \"%s\".",
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argv[i] );
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}
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}
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free_o_rama ( j, &argv );
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if ( internalset && !externalset )
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md->external = 0.0;
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else if ( !internalset && externalset )
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md->internal = 0.0;
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if ( md->sname == NULL )
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{
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++errors;
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error ( E_ERROR, "mutation: no selection method specified." );
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}
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if ( md->mindepth == -1 && md->maxdepth == -1 )
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{
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md->mindepth = 0;
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md->maxdepth = 4;
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}
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if ( md->mindepth < 0 || md->maxdepth < 0 ||
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md->maxdepth < md->mindepth )
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{
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++errors;
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error ( E_ERROR, "mutation: bad depth range.\n" );
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}
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for ( j = 0; j < tree_count; ++j )
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md->treetotal += md->tree[j];
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if ( md->treetotal == 0.0 )
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{
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for ( j = 0; j < tree_count; ++j )
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md->tree[j] = 1.0;
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md->treetotal = tree_count;
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}
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r = 0.0;
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for ( j = 0; j < tree_count; ++j )
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r = (md->tree[j] += r);
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#ifdef DEBUG
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if ( !errors )
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{
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printf ( "mutation options:\n" );
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printf ( " internal: %lf external: %lf\n", md->internal, md->external );
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printf ( " keep_trying: %d\n", md->keep_trying );
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printf ( " selection: %s\n", md->sname==NULL?"NULL":md->sname );
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printf ( " method: %d mindepth: %d maxdepth: %d\n",
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md->method, md->mindepth, md->maxdepth );
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printf ( " tree total: %lf\n", md->treetotal );
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for ( j = 0; j < tree_count; ++j )
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printf ( " tree %d: %lf\n", j, md->tree[j] );
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}
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#endif
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return errors;
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}
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/* operator_mutate_free()
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*
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* free mutation stuff.
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*/
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void operator_mutate_free ( void *data )
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{
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mutate_data * md;
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md = (mutate_data *)data;
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FREE ( md->sname );
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FREE ( md->tree );
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FREE ( md );
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}
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/* operator_mutate_start()
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*
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* get selection context for mutation operator.
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*/
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void operator_mutate_start ( population *oldpop, void *data )
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{
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mutate_data * md;
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select_context_func_ptr select_con;
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md = (mutate_data *)data;
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select_con = get_select_context ( md->sname );
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md->sc = select_con ( SELECT_INIT, NULL, oldpop, md->sname );
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}
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/* operator_mutate_end()
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*
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* free selection context for mutation operator.
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*/
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void operator_mutate_end ( void *data )
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{
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mutate_data * md;
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md = (mutate_data *)data;
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md->sc->context_method ( SELECT_CLEAN, md->sc, NULL, NULL );
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}
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/* operator_mutate()
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*
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* do the mutation.
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*/
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void operator_mutate ( population *oldpop, population *newpop,
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void *data )
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{
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int i;
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int ps;
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lnode *replace[2];
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int l, ns;
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int badtree;
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int repcount;
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mutate_data * md;
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int t;
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double r;
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int depth;
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int totalnodes;
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int p;
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int forceany;
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double total;
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int count=0;
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md = (mutate_data *)data;
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total = md->internal + md->external;
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/* choose a tree to mutate. */
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r = random_double(&globrand) * md->treetotal;
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for ( t = 0; r >= md->tree[t]; ++t );
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/* select an individual to mutate. */
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p = md->sc->select_method ( md->sc );
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ps = tree_nodes ( oldpop->ind[p].tr[t].data );
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forceany = (ps==1||total==0.0);
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#ifdef DEBUG_MUTATE
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fprintf ( stderr, "the parent size is %d\n", ps );
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fprintf ( stderr, " parent %4d: ", p );
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print_tree ( oldpop->ind[p].tr[t].data, stderr );
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#endif
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while(1)
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{
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count++;
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if ( forceany )
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{
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/* choose any point. */
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l = random_int ( &globrand, ps );
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replace[0] = get_subtree ( oldpop->ind[p].tr[t].data, l );
|
||
|
|
}
|
||
|
|
else if ( total*random_double(&globrand) < md->internal )
|
||
|
|
{
|
||
|
|
/* choose an internal point. */
|
||
|
|
l = random_int ( &globrand, tree_nodes_internal ( oldpop->ind[p].tr[t].data ) );
|
||
|
|
replace[0] = get_subtree_internal ( oldpop->ind[p].tr[t].data, l );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/* choose an external point. */
|
||
|
|
l = random_int ( &globrand, tree_nodes_external ( oldpop->ind[p].tr[t].data ) );
|
||
|
|
replace[0] = get_subtree_external ( oldpop->ind[p].tr[t].data, l );
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef DEBUG_MUTATE
|
||
|
|
fprintf ( stderr, "selected for replacement: " );
|
||
|
|
print_tree ( replace[0], stderr );
|
||
|
|
#endif
|
||
|
|
|
||
|
|
gensp_reset ( 1 );
|
||
|
|
/* pick a value from the depth ramp. */
|
||
|
|
depth = md->mindepth + random_int ( &globrand, md->maxdepth - md->mindepth + 1 );
|
||
|
|
/* grow the tree. */
|
||
|
|
switch ( md->method )
|
||
|
|
{
|
||
|
|
case GENERATE_GROW:
|
||
|
|
/* Look up the return type of the parent */
|
||
|
|
generate_random_grow_tree ( 1, depth, fset+tree_map[t].fset,
|
||
|
|
replace[0]->f->return_type);
|
||
|
|
break;
|
||
|
|
case GENERATE_FULL:
|
||
|
|
generate_random_full_tree ( 1, depth, fset+tree_map[t].fset,
|
||
|
|
replace[0]->f->return_type);
|
||
|
|
break;
|
||
|
|
case GENERATE_HALF_AND_HALF:
|
||
|
|
if ( random_double(&globrand) < 0.5 )
|
||
|
|
generate_random_grow_tree ( 1, depth, fset+tree_map[t].fset,
|
||
|
|
replace[0]->f->return_type);
|
||
|
|
else
|
||
|
|
generate_random_full_tree ( 1, depth, fset+tree_map[t].fset ,
|
||
|
|
replace[0]->f->return_type);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef DEBUG_MUTATE
|
||
|
|
fprintf ( stderr, "the new subtree is: " );
|
||
|
|
print_tree ( gensp[1].data, stderr );
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* count the nodes in the new tree. */
|
||
|
|
ns = ps - tree_nodes ( replace[0] ) + tree_nodes ( gensp[1].data );
|
||
|
|
totalnodes = ns;
|
||
|
|
|
||
|
|
/* check the mutated tree against node count and/or size limits. */
|
||
|
|
badtree = 0;
|
||
|
|
if ( tree_map[t].nodelimit > -1 && ns > tree_map[t].nodelimit )
|
||
|
|
badtree = 1;
|
||
|
|
else if ( tree_map[t].depthlimit > -1 )
|
||
|
|
{
|
||
|
|
ns = tree_depth_to_subtree ( oldpop->ind[p].tr[t].data,
|
||
|
|
replace[0] ) +
|
||
|
|
tree_depth ( gensp[1].data );
|
||
|
|
if ( ns > tree_map[t].depthlimit )
|
||
|
|
badtree = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* if tree is too big and keep_trying is set, then skip to the
|
||
|
|
stop and choose a new mutation point/mutant subtree. */
|
||
|
|
if ( md->keep_trying && badtree &&
|
||
|
|
(md->num_times==0 ||
|
||
|
|
md->num_times > count) )
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/* check mutated tree against whole-individual node limits. */
|
||
|
|
if ( ind_nodelimit > -1 )
|
||
|
|
{
|
||
|
|
for ( i = 0; i < tree_count; ++i )
|
||
|
|
if ( i != t )
|
||
|
|
totalnodes += oldpop->ind[p].tr[i].nodes;
|
||
|
|
badtree |= (totalnodes > ind_nodelimit);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* if tree is too big and keep_trying is set, then skip to the
|
||
|
|
stop and choose a new mutation point/mutant subtree. */
|
||
|
|
if ( md->keep_trying && badtree &&
|
||
|
|
(md->num_times==0 ||
|
||
|
|
md->num_times > count))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if ( badtree )
|
||
|
|
{
|
||
|
|
#ifdef DEBUG_MUTATE
|
||
|
|
fprintf ( stderr,
|
||
|
|
"new tree is too big; reproducing parent.\n" );
|
||
|
|
#endif
|
||
|
|
/* tree too big but keep_trying not set, just reproduce
|
||
|
|
parent tree. */
|
||
|
|
duplicate_individual ( (newpop->ind)+newpop->next,
|
||
|
|
(oldpop->ind)+p );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
#ifdef DEBUG_MUTATE
|
||
|
|
fprintf ( stderr, "new tree is permissible.\n" );
|
||
|
|
#endif
|
||
|
|
/* copy the parent tree to the offspring position. */
|
||
|
|
duplicate_individual ( (newpop->ind)+newpop->next,
|
||
|
|
(oldpop->ind)+p );
|
||
|
|
/* free the tree selected for mutation. */
|
||
|
|
free_tree ( newpop->ind[newpop->next].tr+t );
|
||
|
|
|
||
|
|
/* copy the selected tree, replacing the subtree at the
|
||
|
|
mutation point with the randomly generated tree. */
|
||
|
|
replace[1] = gensp[1].data;
|
||
|
|
copy_tree_replace_many ( 0, oldpop->ind[p].tr[t].data,
|
||
|
|
replace, replace+1, 1, &repcount );
|
||
|
|
if ( repcount != 1 )
|
||
|
|
{
|
||
|
|
error ( E_FATAL_ERROR,
|
||
|
|
"botched mutation: this can't happen." );
|
||
|
|
}
|
||
|
|
/* copy the tree to the new individual. */
|
||
|
|
gensp_dup_tree ( 0, newpop->ind[newpop->next].tr+t );
|
||
|
|
newpop->ind[newpop->next].evald = EVAL_CACHE_INVALID;
|
||
|
|
newpop->ind[newpop->next].flags = FLAG_NONE;
|
||
|
|
|
||
|
|
#ifdef DEBUG_MUTATE
|
||
|
|
fprintf ( stderr, " the mutated individual is: " );
|
||
|
|
print_individual ( newpop->ind+newpop->next, stderr );
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
++newpop->next;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef DEBUG_MUTATE
|
||
|
|
printf ( "MUTATION COMPLETE.\n\n\n" );
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|