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96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
/*------------------------------------------------------------------------
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*
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* geqo_ox1.c
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*
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* order crossover [OX] routines;
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* OX1 operator according to Davis
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* (Proc Int'l Joint Conf on AI)
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*
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* src/backend/optimizer/geqo/geqo_ox1.c
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*
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*-------------------------------------------------------------------------
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*/
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/* contributed by:
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=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
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* Martin Utesch * Institute of Automatic Control *
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= = University of Mining and Technology =
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* utesch@aut.tu-freiberg.de * Freiberg, Germany *
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=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
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*/
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/* the ox algorithm is adopted from Genitor : */
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/*************************************************************/
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/* */
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/* Copyright (c) 1990 */
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/* Darrell L. Whitley */
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/* Computer Science Department */
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/* Colorado State University */
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/* */
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/* Permission is hereby granted to copy all or any part of */
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/* this program for free distribution. The author's name */
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/* and this copyright notice must be included in any copy. */
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/* */
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/*************************************************************/
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#include "postgres.h"
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#include "optimizer/geqo_random.h"
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#include "optimizer/geqo_recombination.h"
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#if defined(OX1)
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/* ox1
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*
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* position crossover
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*/
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void
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ox1(PlannerInfo *root, Gene *tour1, Gene *tour2, Gene *offspring, int num_gene,
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City * city_table)
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{
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int left,
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right,
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k,
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p,
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temp;
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/* initialize city table */
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for (k = 1; k <= num_gene; k++)
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city_table[k].used = 0;
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/* select portion to copy from tour1 */
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left = geqo_randint(root, num_gene - 1, 0);
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right = geqo_randint(root, num_gene - 1, 0);
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if (left > right)
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{
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temp = left;
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left = right;
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right = temp;
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}
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/* copy portion from tour1 to offspring */
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for (k = left; k <= right; k++)
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{
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offspring[k] = tour1[k];
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city_table[(int) tour1[k]].used = 1;
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}
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k = (right + 1) % num_gene; /* index into offspring */
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p = k; /* index into tour2 */
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/* copy stuff from tour2 to offspring */
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while (k != left)
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{
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if (!city_table[(int) tour2[p]].used)
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{
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offspring[k] = tour2[p];
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k = (k + 1) % num_gene;
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city_table[(int) tour2[p]].used = 1;
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}
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p = (p + 1) % num_gene; /* increment tour2-index */
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}
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}
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#endif /* defined(OX1) */
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