1 /* histogram/gsl-histogram.c
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
23 #include <gsl/gsl_histogram.h>
26 main (int argc, char **argv)
28 double a = 0.0, b = 1.0;
31 if (argc != 3 && argc !=4)
33 printf ("Usage: gsl-histogram xmin xmax [n]\n");
35 "Computes a histogram of the data on stdin using n bins from xmin to xmax.\n"
36 "If n is unspecified then bins of integer width are used.\n");
54 gsl_histogram *h = gsl_histogram_alloc (n);
56 gsl_histogram_set_ranges_uniform (h, a, b);
58 while (fscanf(stdin, "%lg", &x) == 1)
60 gsl_histogram_increment(h, x);
65 double mean = gsl_histogram_mean (h);
66 double sigma = gsl_histogram_sigma (h);
67 fprintf (stdout, "# mean = %g\n", mean);
68 fprintf (stdout, "# sigma = %g\n", sigma);
72 gsl_histogram_fprintf (stdout, h, "%g", "%g");
74 gsl_histogram_free (h);