| /* histogram/init.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 <gsl/gsl_errno.h> |
| #include <gsl/gsl_histogram.h> |
| |
| gsl_histogram * |
| gsl_histogram_alloc (size_t n) |
| { |
| gsl_histogram *h; |
| |
| if (n == 0) |
| { |
| GSL_ERROR_VAL ("histogram length n must be positive integer", |
| GSL_EDOM, 0); |
| } |
| |
| h = (gsl_histogram *) malloc (sizeof (gsl_histogram)); |
| |
| if (h == 0) |
| { |
| GSL_ERROR_VAL ("failed to allocate space for histogram struct", |
| GSL_ENOMEM, 0); |
| } |
| |
| h->range = (double *) malloc ((n + 1) * sizeof (double)); |
| |
| if (h->range == 0) |
| { |
| free (h); /* exception in constructor, avoid memory leak */ |
| |
| GSL_ERROR_VAL ("failed to allocate space for histogram ranges", |
| GSL_ENOMEM, 0); |
| } |
| |
| h->bin = (double *) malloc (n * sizeof (double)); |
| |
| if (h->bin == 0) |
| { |
| free (h->range); |
| free (h); /* exception in constructor, avoid memory leak */ |
| |
| GSL_ERROR_VAL ("failed to allocate space for histogram bins", |
| GSL_ENOMEM, 0); |
| } |
| |
| h->n = n; |
| |
| return h; |
| } |
| |
| static void |
| make_uniform (double range[], size_t n, double xmin, double xmax) |
| { |
| size_t i; |
| |
| for (i = 0; i <= n; i++) |
| { |
| double f1 = ((double) (n-i) / (double) n); |
| double f2 = ((double) i / (double) n); |
| range[i] = f1 * xmin + f2 * xmax; |
| } |
| } |
| |
| gsl_histogram * |
| gsl_histogram_calloc_uniform (const size_t n, const double xmin, |
| const double xmax) |
| { |
| gsl_histogram *h; |
| |
| if (xmin >= xmax) |
| { |
| GSL_ERROR_VAL ("xmin must be less than xmax", GSL_EINVAL, 0); |
| } |
| |
| h = gsl_histogram_calloc (n); |
| |
| if (h == 0) |
| { |
| return h; |
| } |
| |
| make_uniform (h->range, n, xmin, xmax); |
| |
| return h; |
| } |
| |
| gsl_histogram * |
| gsl_histogram_calloc (size_t n) |
| { |
| gsl_histogram * h = gsl_histogram_alloc (n); |
| |
| if (h == 0) |
| { |
| return h; |
| } |
| |
| { |
| size_t i; |
| |
| for (i = 0; i < n + 1; i++) |
| { |
| h->range[i] = i; |
| } |
| |
| for (i = 0; i < n; i++) |
| { |
| h->bin[i] = 0; |
| } |
| } |
| |
| h->n = n; |
| |
| return h; |
| } |
| |
| |
| void |
| gsl_histogram_free (gsl_histogram * h) |
| { |
| free (h->range); |
| free (h->bin); |
| free (h); |
| } |
| |
| /* These initialization functions suggested by Achim Gaedke */ |
| |
| int |
| gsl_histogram_set_ranges_uniform (gsl_histogram * h, double xmin, double xmax) |
| { |
| size_t i; |
| const size_t n = h->n; |
| |
| if (xmin >= xmax) |
| { |
| GSL_ERROR ("xmin must be less than xmax", GSL_EINVAL); |
| } |
| |
| /* initialize ranges */ |
| |
| make_uniform (h->range, n, xmin, xmax); |
| |
| /* clear contents */ |
| |
| for (i = 0; i < n; i++) |
| { |
| h->bin[i] = 0; |
| } |
| |
| return GSL_SUCCESS; |
| } |
| |
| int |
| gsl_histogram_set_ranges (gsl_histogram * h, const double range[], size_t size) |
| { |
| size_t i; |
| const size_t n = h->n; |
| |
| if (size != (n+1)) |
| { |
| GSL_ERROR ("size of range must match size of histogram", GSL_EINVAL); |
| } |
| |
| /* initialize ranges */ |
| |
| for (i = 0; i <= n; i++) |
| { |
| h->range[i] = range[i]; |
| } |
| |
| /* clear contents */ |
| |
| for (i = 0; i < n; i++) |
| { |
| h->bin[i] = 0; |
| } |
| |
| return GSL_SUCCESS; |
| } |
| |