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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;
}
}
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