src/math/histogram.h

   1 /* PSPP - a program for statistical analysis.
   2    Copyright (C) 2008, 2009, 2011 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
  16
  17 #ifndef __HISTOGRAM_H__
  18 #define __HISTOGRAM_H__
  19
  20 #include <stddef.h>
  21
  22 #include "math/statistic.h"
  23
  24 #include <gsl/gsl_histogram.h>
  25
  26
  27 struct histogram
  28 {
  29   struct statistic parent;
  30   gsl_histogram *gsl_hist;
  31 };
  32
  33 /*
  34    Prepare a histogram for data which lies in the range [min, max)
  35    bin_width is a nominal figure only.  It is a hint about what might be
  36    an good approximate bin width, but the implementation will adjust it
  37    as it thinks fit.
  38  */
  39 struct histogram * histogram_create (double bin_width, double min, double max);
  40
  41 void histogram_add (struct histogram *h, double y, double c);
  42
  43
  44 #endif