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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/Centroid.h"
#include "fl/term/Term.h"
namespace fl {
Centroid::Centroid(int resolution)
: IntegralDefuzzifier(resolution) { }
Centroid::~Centroid() { }
std::string Centroid::className() const {
return "Centroid";
}
Complexity Centroid::complexity(const Term* term) const {
return Complexity().comparison(1).arithmetic(1 + 2 + 1) +
term->complexity().arithmetic(6).multiply(getResolution());
}
scalar Centroid::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 area = 0, xcentroid = 0;
//scalar ycentroid = 0;
for (int i = 0; i < resolution; ++i) {
x = minimum + (i + 0.5) * dx;
y = term->membership(x);
xcentroid += y * x;
//ycentroid += y * y;
area += y;
}
//Final results not computed for efficiency
//xcentroid /= area;
//ycentroid /= 2 * area;
//area *= dx;
return xcentroid / area;
}
Centroid* Centroid::clone() const {
return new Centroid(*this);
}
Defuzzifier* Centroid::constructor() {
return new Centroid;
}
}
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