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/*
Author: Juan Rada-Vilela, Ph.D.
Copyright (C) 2010-2014 FuzzyLite Limited
All rights reserved
This file is part of fuzzylite.
fuzzylite is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
fuzzylite 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 Lesser General Public License
for more details.
You should have received a copy of the GNU Lesser General Public License
along with fuzzylite. If not, see <http://www.gnu.org/licenses/>.
fuzzylite™ is a trademark of FuzzyLite Limited.
*/
#include "fl/defuzzifier/Centroid.h"
#include "fl/term/Accumulated.h"
#include "fl/term/Term.h"
namespace fl {
Centroid::Centroid(int resolution)
: IntegralDefuzzifier(resolution) {
}
Centroid::~Centroid() {
}
std::string Centroid::className() const {
return "Centroid";
}
scalar Centroid::defuzzify(const Term* term, scalar minimum, scalar maximum) const {
if (not fl::Op::isFinite(minimum + maximum)) {
return fl::nan;
}
if (maximum - minimum > _resolution) {
FL_DBG("[accuracy warning] the resolution <" << _resolution << "> "
"is smaller than the range <" << minimum << ", " << maximum << ">. In order to "
"improve the accuracy, the resolution should be at least equal to the range.");
}
scalar dx = (maximum - minimum) / _resolution;
scalar x, y;
scalar area = 0, xcentroid = 0, 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;
}
xcentroid /= area;
ycentroid /= 2 * area;
area *= dx; //total area... unused, but for future reference.
return xcentroid;
}
Centroid* Centroid::clone() const {
return new Centroid(*this);
}
Defuzzifier* Centroid::constructor() {
return new Centroid;
}
}
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