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/* 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 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_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;
}
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