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/* histogram/init.c
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007, 2009 Brian Gough
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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 the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <gsl/gsl_errno.h>
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#include <gsl/gsl_histogram.h>
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gsl_histogram *
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gsl_histogram_alloc (size_t n)
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{
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gsl_histogram *h;
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if (n == 0)
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{
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GSL_ERROR_VAL ("histogram length n must be positive integer",
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GSL_EDOM, 0);
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}
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h = (gsl_histogram *) malloc (sizeof (gsl_histogram));
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if (h == 0)
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{
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GSL_ERROR_VAL ("failed to allocate space for histogram struct",
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GSL_ENOMEM, 0);
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}
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h->range = (double *) malloc ((n + 1) * sizeof (double));
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if (h->range == 0)
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{
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free (h); /* exception in constructor, avoid memory leak */
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GSL_ERROR_VAL ("failed to allocate space for histogram ranges",
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GSL_ENOMEM, 0);
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}
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h->bin = (double *) malloc (n * sizeof (double));
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if (h->bin == 0)
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{
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free (h->range);
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free (h); /* exception in constructor, avoid memory leak */
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GSL_ERROR_VAL ("failed to allocate space for histogram bins",
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GSL_ENOMEM, 0);
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}
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h->n = n;
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return h;
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}
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static void
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make_uniform (double range[], size_t n, double xmin, double xmax)
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{
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size_t i;
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for (i = 0; i <= n; i++)
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{
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double f1 = ((double) (n-i) / (double) n);
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double f2 = ((double) i / (double) n);
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range[i] = f1 * xmin + f2 * xmax;
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}
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}
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gsl_histogram *
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gsl_histogram_calloc_uniform (const size_t n, const double xmin,
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const double xmax)
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{
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gsl_histogram *h;
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if (xmin >= xmax)
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{
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GSL_ERROR_VAL ("xmin must be less than xmax", GSL_EINVAL, 0);
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}
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h = gsl_histogram_calloc (n);
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if (h == 0)
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{
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return h;
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}
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make_uniform (h->range, n, xmin, xmax);
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return h;
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}
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gsl_histogram *
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gsl_histogram_calloc (size_t n)
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{
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gsl_histogram * h = gsl_histogram_alloc (n);
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if (h == 0)
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{
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return h;
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}
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{
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size_t i;
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for (i = 0; i < n + 1; i++)
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{
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h->range[i] = i;
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}
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for (i = 0; i < n; i++)
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{
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h->bin[i] = 0;
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}
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}
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h->n = n;
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return h;
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}
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void
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gsl_histogram_free (gsl_histogram * h)
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{
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RETURN_IF_NULL (h);
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free (h->range);
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free (h->bin);
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free (h);
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}
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/* These initialization functions suggested by Achim Gaedke */
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int
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gsl_histogram_set_ranges_uniform (gsl_histogram * h, double xmin, double xmax)
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{
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size_t i;
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const size_t n = h->n;
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if (xmin >= xmax)
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{
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GSL_ERROR ("xmin must be less than xmax", GSL_EINVAL);
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}
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/* initialize ranges */
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make_uniform (h->range, n, xmin, xmax);
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/* clear contents */
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for (i = 0; i < n; i++)
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{
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h->bin[i] = 0;
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}
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return GSL_SUCCESS;
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}
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int
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gsl_histogram_set_ranges (gsl_histogram * h, const double range[], size_t size)
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{
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size_t i;
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const size_t n = h->n;
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if (size != (n+1))
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{
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GSL_ERROR ("size of range must match size of histogram", GSL_EINVAL);
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}
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/* initialize ranges */
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for (i = 0; i <= n; i++)
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{
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h->range[i] = range[i];
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}
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/* clear contents */
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for (i = 0; i < n; i++)
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{
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h->bin[i] = 0;
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}
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return GSL_SUCCESS;
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}
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