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+/*
+ fuzzylite (R), a fuzzy logic control library in C++.
+ Copyright (C) 2010-2017 FuzzyLite Limited. All rights reserved.
+ Author: Juan Rada-Vilela, Ph.D. <jcrada@fuzzylite.com>
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the FuzzyLite License included with the software.
+
+ You should have received a copy of the FuzzyLite License along with
+ fuzzylite. If not, see <http://www.fuzzylite.com/license/>.
+
+ fuzzylite is a registered trademark of FuzzyLite Limited.
+ */
+
+#include "fl/defuzzifier/MeanOfMaximum.h"
+
+#include "fl/Exception.h"
+#include "fl/term/Term.h"
+
+namespace fl {
+
+ MeanOfMaximum::MeanOfMaximum(int resolution)
+ : IntegralDefuzzifier(resolution) { }
+
+ MeanOfMaximum::~MeanOfMaximum() { }
+
+ std::string MeanOfMaximum::className() const {
+ return "MeanOfMaximum";
+ }
+
+ Complexity MeanOfMaximum::complexity(const Term* term) const {
+ return Complexity().comparison(1).arithmetic(1 + 2 + 2) +
+ term->complexity().comparison(4).arithmetic(3).multiply(getResolution());
+ }
+
+ scalar MeanOfMaximum::defuzzify(const Term* term, scalar minimum, scalar maximum) const {
+ if (not Op::isFinite(minimum + maximum)) return fl::nan;
+
+ const int resolution = getResolution();
+ const scalar dx = (maximum - minimum) / resolution;
+ scalar x, y;
+ scalar ymax = -1.0;
+ scalar xsmallest = minimum;
+ scalar xlargest = maximum;
+ bool samePlateau = false;
+ for (int i = 0; i < resolution; ++i) {
+ x = minimum + (i + 0.5) * dx;
+ y = term->membership(x);
+
+ if (Op::isGt(y, ymax)) {
+ ymax = y;
+
+ xsmallest = x;
+ xlargest = x;
+
+ samePlateau = true;
+ } else if (samePlateau and Op::isEq(y, ymax)) {
+ xlargest = x;
+ } else if (Op::isLt(y, ymax)) {
+ samePlateau = false;
+ }
+ }
+
+ return 0.5 * (xlargest + xsmallest);
+ }
+
+ MeanOfMaximum* MeanOfMaximum::clone() const {
+ return new MeanOfMaximum(*this);
+ }
+
+ Defuzzifier* MeanOfMaximum::constructor() {
+ return new MeanOfMaximum;
+ }
+
+}