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[pspp-builds.git] / src / math / extrema.h

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+/* PSPP - a program for statistical analysis.
+   Copyright (C) 2008 Free Software Foundation, Inc.
+
+   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 3 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, see <http://www.gnu.org/licenses/>. */
+
+#ifndef __EXTREMA_H__
+#define __EXTREMA_H__ 1
+
+#include <stddef.h>
+#include <data/case.h>
+#include <libpspp/ll.h>
+
+struct extremum
+{
+  double value;
+  casenumber location;
+  double weight;
+
+  /* Internal use only */
+  struct ll ll;
+};
+
+
+enum extreme_end
+  {
+    EXTREME_MAXIMA,
+    EXTREME_MINIMA
+  };
+
+struct extrema;
+
+struct extrema *extrema_create (size_t n, enum extreme_end);
+
+void extrema_destroy (struct extrema *extrema);
+
+void extrema_add (struct extrema *extrema, double val,
+                 double weight,
+                 casenumber location);
+
+void extrema_show (const struct extrema *extrema);
+
+const struct ll_list * extrema_list (const struct extrema *);
+
+bool extrema_top (const struct extrema *, double *);
+
+
+#endif