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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/Bisector.h"
+
+#include "fl/term/Term.h"
+
+namespace fl {
+
+ Bisector::Bisector(int resolution)
+ : IntegralDefuzzifier(resolution) { }
+
+ Bisector::~Bisector() { }
+
+ std::string Bisector::className() const {
+ return "Bisector";
+ }
+
+ Complexity Bisector::complexity(const Term* term) const {
+ return Complexity().comparison(1).arithmetic(1 + 2 + 5) +
+ term->complexity().comparison(1).arithmetic(1 + 5).multiply(getResolution());
+ }
+
+ scalar Bisector::defuzzify(const Term* term, scalar minimum, scalar maximum) const {
+ if (not Op::isFinite(minimum + maximum)) return fl::nan;
+
+ const scalar dx = (maximum - minimum) / getResolution();
+ int counter = getResolution();
+ int left = 0, right = 0;
+ scalar leftArea = 0, rightArea = 0;
+ scalar xLeft = minimum, xRight = maximum;
+ while (counter-- > 0) {
+ if (Op::isLE(leftArea, rightArea)) {
+ xLeft = minimum + (left + 0.5) * dx;
+ leftArea += term->membership(xLeft);
+ ++left;
+ } else {
+ xRight = maximum - (right + 0.5) * dx;
+ rightArea += term->membership(xRight);
+ ++right;
+ }
+ }
+ //Inverse weighted average to compensate
+ return (leftArea * xRight + rightArea * xLeft) / (leftArea + rightArea);
+ }
+
+ Bisector* Bisector::clone() const {
+ return new Bisector(*this);
+ }
+
+ Defuzzifier* Bisector::constructor() {
+ return new Bisector;
+ }
+
+}