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- /* permutation/init.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
- *
- * 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 3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- #include "gsl__config.h"
- #include <stdlib.h>
- #include "gsl_errno.h"
- #include "gsl_permutation.h"
- gsl_permutation *
- gsl_permutation_alloc (const size_t n)
- {
- gsl_permutation * p;
- if (n == 0)
- {
- GSL_ERROR_VAL ("permutation length n must be positive integer",
- GSL_EDOM, 0);
- }
- p = (gsl_permutation *) malloc (sizeof (gsl_permutation));
- if (p == 0)
- {
- GSL_ERROR_VAL ("failed to allocate space for permutation struct",
- GSL_ENOMEM, 0);
- }
- p->data = (size_t *) malloc (n * sizeof (size_t));
- if (p->data == 0)
- {
- free (p); /* exception in constructor, avoid memory leak */
- GSL_ERROR_VAL ("failed to allocate space for permutation data",
- GSL_ENOMEM, 0);
- }
- p->size = n;
- return p;
- }
- gsl_permutation *
- gsl_permutation_calloc (const size_t n)
- {
- size_t i;
- gsl_permutation * p = gsl_permutation_alloc (n);
- if (p == 0)
- return 0;
- /* initialize permutation to identity */
- for (i = 0; i < n; i++)
- {
- p->data[i] = i;
- }
- return p;
- }
- void
- gsl_permutation_init (gsl_permutation * p)
- {
- const size_t n = p->size ;
- size_t i;
- /* initialize permutation to identity */
- for (i = 0; i < n; i++)
- {
- p->data[i] = i;
- }
- }
- void
- gsl_permutation_free (gsl_permutation * p)
- {
- free (p->data);
- free (p);
- }
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