| /* histogram/gsl-histogram.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 <stdio.h> |
| #include <stdlib.h> |
| #include <gsl/gsl_histogram.h> |
| |
| int |
| main (int argc, char **argv) |
| { |
| double a = 0.0, b = 1.0; |
| size_t n = 10; |
| |
| if (argc != 3 && argc !=4) |
| { |
| printf ("Usage: gsl-histogram xmin xmax [n]\n"); |
| printf ( |
| "Computes a histogram of the data on stdin using n bins from xmin to xmax.\n" |
| "If n is unspecified then bins of integer width are used.\n"); |
| exit (0); |
| } |
| |
| a = atof (argv[1]); |
| b = atof (argv[2]); |
| |
| if (argc == 4) |
| { |
| n = atoi (argv[3]); |
| } |
| else |
| { |
| n = (int)(b - a) ; |
| } |
| |
| { |
| double x; |
| gsl_histogram *h = gsl_histogram_alloc (n); |
| |
| gsl_histogram_set_ranges_uniform (h, a, b); |
| |
| while (fscanf(stdin, "%lg", &x) == 1) |
| { |
| gsl_histogram_increment(h, x); |
| } |
| |
| #ifdef DISPLAY_STATS |
| { |
| double mean = gsl_histogram_mean (h); |
| double sigma = gsl_histogram_sigma (h); |
| fprintf (stdout, "# mean = %g\n", mean); |
| fprintf (stdout, "# sigma = %g\n", sigma); |
| } |
| #endif |
| |
| gsl_histogram_fprintf (stdout, h, "%g", "%g"); |
| |
| gsl_histogram_free (h); |
| } |
| |
| return 0; |
| } |