diff options
Diffstat (limited to 'gsl-1.9/histogram/test2d_resample.c')
-rw-r--r-- | gsl-1.9/histogram/test2d_resample.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/gsl-1.9/histogram/test2d_resample.c b/gsl-1.9/histogram/test2d_resample.c new file mode 100644 index 0000000..4df207f --- /dev/null +++ b/gsl-1.9/histogram/test2d_resample.c @@ -0,0 +1,115 @@ +/* histogram/test2d_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_histogram2d.h> +#include <gsl/gsl_test.h> +#include <gsl/gsl_ieee_utils.h> + +#include "urand.c" + +void +test2d_resample (void) +{ + size_t i, j; + int status = 0; + double total = 0; + size_t N = 200000; + + gsl_histogram2d *h; + + gsl_ieee_env_setup (); + + h = gsl_histogram2d_calloc_uniform (10, 10, 0.0, 1.0, 0.0, 1.0); + + for (i = 0; i < 10; i++) + { + for (j = 0; j < 10; j++) + { + double w = 10.0 * i + j; + total += w; + gsl_histogram2d_accumulate (h, 0.1 * i, 0.1 * i, w); + } + } + + { + gsl_histogram2d_pdf *p = gsl_histogram2d_pdf_alloc (10,10); + + gsl_histogram2d *hh = gsl_histogram2d_calloc_uniform (20, 20, + 0.0, 1.0, + 0.0, 1.0); + + gsl_histogram2d_pdf_init (p, h); + + for (i = 0; i < N; i++) + { + double u = urand(); + double v = urand(); + double x, y; + status = gsl_histogram2d_pdf_sample (p, u, v, &x, &y); + status = gsl_histogram2d_increment (hh, x, y); + } + + status = 0; + for (i = 0; i < 20; i++) + { + for (j = 0; j < 20; j++) + { + double z = 4 * total * gsl_histogram2d_get (hh, i, j) / (double) N; + size_t k1, k2; + double ya; + double x, xmax, y, ymax; + + gsl_histogram2d_get_xrange (hh, i, &x, &xmax); + gsl_histogram2d_get_yrange (hh, j, &y, &ymax); + + gsl_histogram2d_find (h, x, y, &k1, &k2); + ya = gsl_histogram2d_get (h, k1, k2); + + if (ya == 0) + { + if (z != 0) + { + status = 1; + printf ("(%d,%d): %g vs %g\n", (int)i, (int)j, z, ya); + } + } + else + { + double err = 1 / sqrt (gsl_histogram2d_get (hh, i, j)); + double sigma = fabs ((z - ya) / (ya * err)); + if (sigma > 3) + { + status = 1; + printf ("%g vs %g err=%g sigma=%g\n", z, ya, err, sigma); + } + } + } + } + + gsl_histogram2d_pdf_free (p) ; + gsl_histogram2d_free (hh) ; + + gsl_test (status, "gsl_histogram2d_pdf_sample within statistical errors"); + } + + gsl_histogram2d_free (h) ; +} |