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/* histogram/test1d_resample.c
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <math.h>
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#include <gsl/gsl_histogram.h>
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#include <gsl/gsl_test.h>
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#include <gsl/gsl_ieee_utils.h>
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#include "urand.c"
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void
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test1d_resample (void)
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{
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size_t i;
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int status = 0;
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gsl_histogram *h;
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gsl_ieee_env_setup ();
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h = gsl_histogram_calloc_uniform (10, 0.0, 1.0);
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gsl_histogram_increment (h, 0.1);
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gsl_histogram_increment (h, 0.2);
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gsl_histogram_increment (h, 0.2);
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gsl_histogram_increment (h, 0.3);
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{
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gsl_histogram_pdf *p = gsl_histogram_pdf_alloc (10);
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gsl_histogram *hh = gsl_histogram_calloc_uniform (100, 0.0, 1.0);
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gsl_histogram_pdf_init (p, h);
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for (i = 0; i < 100000; i++)
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{
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double u = urand();
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double x = gsl_histogram_pdf_sample (p, u);
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gsl_histogram_increment (hh, x);
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}
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for (i = 0; i < 100; i++)
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{
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double y = gsl_histogram_get (hh, i) / 2500;
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double x, xmax;
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size_t k;
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double ya;
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gsl_histogram_get_range (hh, i, &x, &xmax;;
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gsl_histogram_find (h, x, &k);
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ya = gsl_histogram_get (h, k);
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if (ya == 0)
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{
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if (y != 0)
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{
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printf ("%d: %g vs %g\n", (int) i, y, ya);
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status = 1;
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}
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}
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else
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{
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double err = 1 / sqrt (gsl_histogram_get (hh, i));
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double sigma = fabs ((y - ya) / (ya * err));
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if (sigma > 3)
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{
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status = 1;
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printf ("%g vs %g err=%g sigma=%g\n", y, ya, err, sigma);
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}
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}
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}
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gsl_histogram_pdf_free (p) ;
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gsl_histogram_free (hh);
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gsl_test (status, "gsl_histogram_pdf_sample within statistical errors");
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}
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gsl_histogram_free (h);
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}
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