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/* gsl_histogram2d_oper.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_oper.c:
* Routine to make operation on 2D histograms.
* Need GSL library and header.
* Contains the routines:
* gsl_histogram2d_same_binning check if two histograms have the same binning
* gsl_histogram2d_add add two histogram
* gsl_histogram2d_sub subctract two histogram
* gsl_histogram2d_mult multiply two histogram
* gsl_histogram2d_div divide two histogram
* gsl_histogram2d_scale scale histogram contents
*
* Author: S. Piccardi
* Jan. 2000
*
***************************************************************/
#include <config.h>
#include <stdlib.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_histogram2d.h>
/*
* gsl_histogram2d_same_binning:
* control if two histogram have the
* same binning
*/
int
gsl_histogram2d_equal_bins_p (const gsl_histogram2d * h1,
const gsl_histogram2d * h2)
{
if ((h1->nx != h2->nx) || (h1->ny != h2->ny))
{
return 0;
}
{
size_t i;
/* init ranges */
for (i = 0; i <= (h1->nx); i++)
{
if (h1->xrange[i] != h2->xrange[i])
{
return 0;
}
}
for (i = 0; i <= (h1->ny); i++)
{
if (h1->yrange[i] != h2->yrange[i])
{
return 0;
}
}
}
return 1;
}
/*
* gsl_histogram2d_add:
* add two histogram
*/
int
gsl_histogram2d_add (gsl_histogram2d * h1, const gsl_histogram2d * h2)
{
size_t i;
if (!gsl_histogram2d_equal_bins_p (h1, h2))
{
GSL_ERROR ("histograms have different binning", GSL_EINVAL);
}
for (i = 0; i < (h1->nx) * (h1->ny); i++)
{
h1->bin[i] += h2->bin[i];
}
return GSL_SUCCESS;
}
/*
* gsl_histogram2d_sub:
* subtract two histogram
*/
int
gsl_histogram2d_sub (gsl_histogram2d * h1, const gsl_histogram2d * h2)
{
size_t i;
if (!gsl_histogram2d_equal_bins_p (h1, h2))
{
GSL_ERROR ("histograms have different binning", GSL_EINVAL);
}
for (i = 0; i < (h1->nx) * (h1->ny); i++)
{
h1->bin[i] -= h2->bin[i];
}
return GSL_SUCCESS;
}
/*
* gsl_histogram2d_mult:
* multiply two histogram
*/
int
gsl_histogram2d_mul (gsl_histogram2d * h1, const gsl_histogram2d * h2)
{
size_t i;
if (!gsl_histogram2d_equal_bins_p (h1, h2))
{
GSL_ERROR ("histograms have different binning", GSL_EINVAL);
}
for (i = 0; i < (h1->nx) * (h1->ny); i++)
{
h1->bin[i] *= h2->bin[i];
}
return GSL_SUCCESS;
}
/*
* gsl_histogram2d_div:
* divide two histogram
*/
int
gsl_histogram2d_div (gsl_histogram2d * h1, const gsl_histogram2d * h2)
{
size_t i;
if (!gsl_histogram2d_equal_bins_p (h1, h2))
{
GSL_ERROR ("histograms have different binning", GSL_EINVAL);
}
for (i = 0; i < (h1->nx) * (h1->ny); i++)
{
h1->bin[i] /= h2->bin[i];
}
return GSL_SUCCESS;
}
/*
* gsl_histogram2d_scale:
* scale a histogram by a numeric factor
*/
int
gsl_histogram2d_scale (gsl_histogram2d * h, double scale)
{
size_t i;
for (i = 0; i < (h->nx) * (h->ny); i++)
{
h->bin[i] *= scale;
}
return GSL_SUCCESS;
}
/*
* gsl_histogram2d_shift:
* shift a histogram by a numeric offset
*/
int
gsl_histogram2d_shift (gsl_histogram2d * h, double shift)
{
size_t i;
for (i = 0; i < (h->nx) * (h->ny); i++)
{
h->bin[i] += shift;
}
return GSL_SUCCESS;
}
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