| /* histogram/test1d_resample.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_histogram.h> |
| #include <gsl/gsl_test.h> |
| #include <gsl/gsl_ieee_utils.h> |
| |
| #include "urand.c" |
| |
| void |
| test1d_resample (void) |
| { |
| size_t i; |
| int status = 0; |
| |
| gsl_histogram *h; |
| |
| gsl_ieee_env_setup (); |
| |
| h = gsl_histogram_calloc_uniform (10, 0.0, 1.0); |
| |
| gsl_histogram_increment (h, 0.1); |
| gsl_histogram_increment (h, 0.2); |
| gsl_histogram_increment (h, 0.2); |
| gsl_histogram_increment (h, 0.3); |
| |
| { |
| gsl_histogram_pdf *p = gsl_histogram_pdf_alloc (10); |
| |
| gsl_histogram *hh = gsl_histogram_calloc_uniform (100, 0.0, 1.0); |
| |
| gsl_histogram_pdf_init (p, h); |
| |
| for (i = 0; i < 100000; i++) |
| { |
| double u = urand(); |
| double x = gsl_histogram_pdf_sample (p, u); |
| gsl_histogram_increment (hh, x); |
| } |
| |
| for (i = 0; i < 100; i++) |
| { |
| double y = gsl_histogram_get (hh, i) / 2500; |
| double x, xmax; |
| size_t k; |
| double ya; |
| |
| gsl_histogram_get_range (hh, i, &x, &xmax); |
| |
| gsl_histogram_find (h, x, &k); |
| ya = gsl_histogram_get (h, k); |
| |
| if (ya == 0) |
| { |
| if (y != 0) |
| { |
| printf ("%d: %g vs %g\n", (int) i, y, ya); |
| status = 1; |
| } |
| } |
| else |
| { |
| double err = 1 / sqrt (gsl_histogram_get (hh, i)); |
| double sigma = fabs ((y - ya) / (ya * err)); |
| if (sigma > 3) |
| { |
| status = 1; |
| printf ("%g vs %g err=%g sigma=%g\n", y, ya, err, sigma); |
| } |
| } |
| } |
| |
| gsl_histogram_pdf_free (p) ; |
| gsl_histogram_free (hh); |
| |
| gsl_test (status, "gsl_histogram_pdf_sample within statistical errors"); |
| } |
| |
| gsl_histogram_free (h); |
| } |