text: /* 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 2 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., 59 Temple Place - Suite 330,
   * Boston, MA 02111-1307, 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;
  }
  