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/* histogram/init2d.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000 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 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 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 <math.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_histogram2d.h>
gsl_histogram2d *
gsl_histogram2d_alloc (const size_t nx, const size_t ny)
{
gsl_histogram2d *h;
if (nx == 0)
{
GSL_ERROR_VAL ("histogram2d length nx must be positive integer",
GSL_EDOM, 0);
}
if (ny == 0)
{
GSL_ERROR_VAL ("histogram2d length ny must be positive integer",
GSL_EDOM, 0);
}
h = (gsl_histogram2d *) malloc (sizeof (gsl_histogram2d));
if (h == 0)
{
GSL_ERROR_VAL ("failed to allocate space for histogram2d struct",
GSL_ENOMEM, 0);
}
h->xrange = (double *) malloc ((nx + 1) * sizeof (double));
if (h->xrange == 0)
{
free (h); /* exception in constructor, avoid memory leak */
GSL_ERROR_VAL ("failed to allocate space for histogram2d x ranges",
GSL_ENOMEM, 0);
}
h->yrange = (double *) malloc ((ny + 1) * sizeof (double));
if (h->yrange == 0)
{
free (h->xrange);
free (h); /* exception in constructor, avoid memory leak */
GSL_ERROR_VAL ("failed to allocate space for histogram2d y ranges",
GSL_ENOMEM, 0);
}
h->bin = (double *) malloc (nx * ny * sizeof (double));
if (h->bin == 0)
{
free (h->xrange);
free (h->yrange);
free (h); /* exception in constructor, avoid memory leak */
GSL_ERROR_VAL ("failed to allocate space for histogram bins",
GSL_ENOMEM, 0);
}
h->nx = nx;
h->ny = ny;
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_histogram2d *
gsl_histogram2d_calloc_uniform (const size_t nx, const size_t ny,
const double xmin, const double xmax,
const double ymin, const double ymax)
{
gsl_histogram2d *h;
if (xmin >= xmax)
{
GSL_ERROR_VAL ("xmin must be less than xmax", GSL_EINVAL, 0);
}
if (ymin >= ymax)
{
GSL_ERROR_VAL ("ymin must be less than ymax", GSL_EINVAL, 0);
}
h = gsl_histogram2d_calloc (nx, ny);
if (h == 0)
{
return h;
}
make_uniform (h->xrange, nx, xmin, xmax);
make_uniform (h->yrange, ny, ymin, ymax);
return h;
}
gsl_histogram2d *
gsl_histogram2d_calloc (const size_t nx, const size_t ny)
{
gsl_histogram2d *h;
if (nx == 0)
{
GSL_ERROR_VAL ("histogram2d length nx must be positive integer",
GSL_EDOM, 0);
}
if (ny == 0)
{
GSL_ERROR_VAL ("histogram2d length ny must be positive integer",
GSL_EDOM, 0);
}
h = (gsl_histogram2d *) malloc (sizeof (gsl_histogram2d));
if (h == 0)
{
GSL_ERROR_VAL ("failed to allocate space for histogram2d struct",
GSL_ENOMEM, 0);
}
h->xrange = (double *) malloc ((nx + 1) * sizeof (double));
if (h->xrange == 0)
{
free (h); /* exception in constructor, avoid memory leak */
GSL_ERROR_VAL ("failed to allocate space for histogram2d x ranges",
GSL_ENOMEM, 0);
}
h->yrange = (double *) malloc ((ny + 1) * sizeof (double));
if (h->yrange == 0)
{
free (h->xrange);
free (h); /* exception in constructor, avoid memory leak */
GSL_ERROR_VAL ("failed to allocate space for histogram2d y ranges",
GSL_ENOMEM, 0);
}
h->bin = (double *) malloc (nx * ny * sizeof (double));
if (h->bin == 0)
{
free (h->xrange);
free (h->yrange);
free (h); /* exception in constructor, avoid memory leak */
GSL_ERROR_VAL ("failed to allocate space for histogram bins",
GSL_ENOMEM, 0);
}
{
size_t i;
for (i = 0; i < nx + 1; i++)
{
h->xrange[i] = i;
}
for (i = 0; i < ny + 1; i++)
{
h->yrange[i] = i;
}
for (i = 0; i < nx * ny; i++)
{
h->bin[i] = 0;
}
}
h->nx = nx;
h->ny = ny;
return h;
}
void
gsl_histogram2d_free (gsl_histogram2d * h)
{
free (h->xrange);
free (h->yrange);
free (h->bin);
free (h);
}
int
gsl_histogram2d_set_ranges_uniform (gsl_histogram2d * h,
double xmin, double xmax,
double ymin, double ymax)
{
size_t i;
const size_t nx = h->nx, ny = h->ny;
if (xmin >= xmax)
{
GSL_ERROR_VAL ("xmin must be less than xmax", GSL_EINVAL, 0);
}
if (ymin >= ymax)
{
GSL_ERROR_VAL ("ymin must be less than ymax", GSL_EINVAL, 0);
}
/* initialize ranges */
make_uniform (h->xrange, nx, xmin, xmax);
make_uniform (h->yrange, ny, ymin, ymax);
/* clear contents */
for (i = 0; i < nx * ny; i++)
{
h->bin[i] = 0;
}
return GSL_SUCCESS;
}
int
gsl_histogram2d_set_ranges (gsl_histogram2d * h,
const double xrange[], size_t xsize,
const double yrange[], size_t ysize)
{
size_t i;
const size_t nx = h->nx, ny = h->ny;
if (xsize != (nx + 1))
{
GSL_ERROR_VAL ("size of xrange must match size of histogram",
GSL_EINVAL, 0);
}
if (ysize != (ny + 1))
{
GSL_ERROR_VAL ("size of yrange must match size of histogram",
GSL_EINVAL, 0);
}
/* initialize ranges */
for (i = 0; i <= nx; i++)
{
h->xrange[i] = xrange[i];
}
for (i = 0; i <= ny; i++)
{
h->yrange[i] = yrange[i];
}
/* clear contents */
for (i = 0; i < nx * ny; i++)
{
h->bin[i] = 0;
}
return GSL_SUCCESS;
}
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