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/* histogram/init.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007, 2009 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 <config.h>
#include <stdlib.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_histogram.h>
gsl_histogram *
gsl_histogram_alloc (size_t n)
{
gsl_histogram *h;
if (n == 0)
{
GSL_ERROR_VAL ("histogram length n must be positive integer",
GSL_EDOM, 0);
}
h = (gsl_histogram *) malloc (sizeof (gsl_histogram));
if (h == 0)
{
GSL_ERROR_VAL ("failed to allocate space for histogram struct",
GSL_ENOMEM, 0);
}
h->range = (double *) malloc ((n + 1) * sizeof (double));
if (h->range == 0)
{
free (h); /* exception in constructor, avoid memory leak */
GSL_ERROR_VAL ("failed to allocate space for histogram ranges",
GSL_ENOMEM, 0);
}
h->bin = (double *) malloc (n * sizeof (double));
if (h->bin == 0)
{
free (h->range);
free (h); /* exception in constructor, avoid memory leak */
GSL_ERROR_VAL ("failed to allocate space for histogram bins",
GSL_ENOMEM, 0);
}
h->n = n;
return h;
}
static void
make_uniform (double range[], size_t n, double xmin, double xmax)
{
size_t i;
for (i = 0; i <= n; i++)
{
double f1 = ((double) (n-i) / (double) n);
double f2 = ((double) i / (double) n);
range[i] = f1 * xmin + f2 * xmax;
}
}
gsl_histogram *
gsl_histogram_calloc_uniform (const size_t n, const double xmin,
const double xmax)
{
gsl_histogram *h;
if (xmin >= xmax)
{
GSL_ERROR_VAL ("xmin must be less than xmax", GSL_EINVAL, 0);
}
h = gsl_histogram_calloc (n);
if (h == 0)
{
return h;
}
make_uniform (h->range, n, xmin, xmax);
return h;
}
gsl_histogram *
gsl_histogram_calloc (size_t n)
{
gsl_histogram * h = gsl_histogram_alloc (n);
if (h == 0)
{
return h;
}
{
size_t i;
for (i = 0; i < n + 1; i++)
{
h->range[i] = i;
}
for (i = 0; i < n; i++)
{
h->bin[i] = 0;
}
}
h->n = n;
return h;
}
void
gsl_histogram_free (gsl_histogram * h)
{
RETURN_IF_NULL (h);
free (h->range);
free (h->bin);
free (h);
}
/* These initialization functions suggested by Achim Gaedke */
int
gsl_histogram_set_ranges_uniform (gsl_histogram * h, double xmin, double xmax)
{
size_t i;
const size_t n = h->n;
if (xmin >= xmax)
{
GSL_ERROR ("xmin must be less than xmax", GSL_EINVAL);
}
/* initialize ranges */
make_uniform (h->range, n, xmin, xmax);
/* clear contents */
for (i = 0; i < n; i++)
{
h->bin[i] = 0;
}
return GSL_SUCCESS;
}
int
gsl_histogram_set_ranges (gsl_histogram * h, const double range[], size_t size)
{
size_t i;
const size_t n = h->n;
if (size != (n+1))
{
GSL_ERROR ("size of range must match size of histogram", GSL_EINVAL);
}
/* initialize ranges */
for (i = 0; i <= n; i++)
{
h->range[i] = range[i];
}
/* clear contents */
for (i = 0; i < n; i++)
{
h->bin[i] = 0;
}
return GSL_SUCCESS;
}
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