src/math/extrema.h

   1 /* PSPP - a program for statistical analysis.
   2    Copyright (C) 2008, 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 __EXTREMA_H__
  18 #define __EXTREMA_H__ 1
  19
  20 #include <stddef.h>
  21 #include "data/case.h"
  22 #include "libpspp/ll.h"
  23
  24 struct extremum
  25 {
  26   double value;
  27   casenumber location;
  28   double weight;
  29
  30   /* Internal use only */
  31   struct ll ll;
  32 };
  33
  34
  35 enum extreme_end
  36   {
  37     EXTREME_MAXIMA,
  38     EXTREME_MINIMA
  39   };
  40
  41 struct extrema;
  42
  43 struct extrema *extrema_create (size_t n, enum extreme_end);
  44
  45 void extrema_destroy (struct extrema *extrema);
  46
  47 void extrema_add (struct extrema *extrema, double val,
  48                   double weight,
  49                   casenumber location);
  50
  51 void extrema_show (const struct extrema *extrema);
  52
  53 const struct ll_list * extrema_list (const struct extrema *);
  54
  55 bool extrema_top (const struct extrema *, double *);
  56
  57
  58 #endif