/* gsl_histogram2d_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_histogram2d_calloc_range.c: 

 * Routine to create a variable binning 2D histogram providing 

 * the input range vectors. 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_histogram2d.h>

/*

 * Routine that create a 2D histogram using the given 

 * values for X and Y ranges

 */

gsl_histogram2d *

gsl_histogram2d_calloc_range (size_t nx, size_t ny,

                              double *xrange,

                              double *yrange)

{

  size_t i, j;

  gsl_histogram2d *h;

  /* check arguments */

  if (nx == 0)

    {

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

                        GSL_EDOM, 0);

    }

  if (ny == 0)

    {

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

                        GSL_EDOM, 0);

    }

  /* init ranges */

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

    {

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

        {

          GSL_ERROR_VAL ("histogram xrange not in increasing order",

                            GSL_EDOM, 0);

        }

    }

  for (j = 0; j < ny; j++)

    {

      if (yrange[j] >= yrange[j + 1])

        {

          GSL_ERROR_VAL ("histogram yrange not in increasing order"

                            ,GSL_EDOM, 0);

        }

    }

  /* Allocate histogram  */

  h = (gsl_histogram2d *) malloc (sizeof (gsl_histogram2d));

  if (h == 0)

    {

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

                        GSL_ENOMEM, 0);

    }

  h->xrange = (double *) malloc ((nx + 1) * sizeof (double));

  if (h->xrange == 0)

    {

      /* exception in constructor, avoid memory leak */

      free (h);

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

                        GSL_ENOMEM, 0);

    }

  h->yrange = (double *) malloc ((ny + 1) * sizeof (double));

  if (h->yrange == 0)

    {

      /* exception in constructor, avoid memory leak */

      free (h);

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

                        GSL_ENOMEM, 0);

    }

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

  if (h->bin == 0)

    {

      /* exception in constructor, avoid memory leak */

      free (h->xrange);

      free (h->yrange);

      free (h);

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

                        GSL_ENOMEM, 0);

    }

  /* init histogram */

  /* init ranges */

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

    {

      h->xrange[i] = xrange[i];

    }

  for (j = 0; j <= ny; j++)

    {

      h->yrange[j] = yrange[j];

    }

  /* clear contents */

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

    {

      for (j = 0; j < ny; j++)

        {

          h->bin[i * ny + j] = 0;

        }

    }

  h->nx = nx;

  h->ny = ny;

  return h;

}