/* gsl_histogram_calloc_range.c

 * Copyright (C) 2000  Simone Piccardi

 *

 * This library 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 library; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 */

/***************************************************************

 *

 * File gsl_histogram_calloc_range.c: 

 * Routine to create a variable binning histogram providing 

 * an input range vector. Need GSL library and header.

 * Do range check and allocate the histogram data. 

 *

 * Author: S. Piccardi

 * Jan. 2000

 *

 ***************************************************************/

#include <config.h>

#include <stdlib.h>

#include <gsl/gsl_errno.h>

#include <gsl/gsl_histogram.h>

gsl_histogram *

gsl_histogram_calloc_range (size_t n, double *range)

{

  size_t i;

  gsl_histogram *h;

  /* check arguments */

  if (n == 0)

    {

      GSL_ERROR_VAL ("histogram length n must be positive integer",

                        GSL_EDOM, 0);

    }

  /* check ranges */

  for (i = 0; i < n; i++)

    {

      if (range[i] >= range[i + 1])

        {

          GSL_ERROR_VAL ("histogram bin extremes  must be "

                            "in increasing order", GSL_EDOM, 0);

        }

    }

  /* Allocate histogram  */

  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)

    {

      /* exception in constructor, avoid memory leak */

      free (h);

      GSL_ERROR_VAL ("failed to allocate space for histogram ranges",

                        GSL_ENOMEM, 0);

    }

  h->bin = (double *) malloc (n * sizeof (double));

  if (h->bin == 0)

    {

      /* exception in constructor, avoid memory leak */

      free (h->range);

      free (h);

      GSL_ERROR_VAL ("failed to allocate space for histogram bins",

                        GSL_ENOMEM, 0);

    }

  /* 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;

    }

  h->n = n;

  return h;

}