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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/term/SShape.h"
namespace fl {
SShape::SShape(const std::string& name, scalar start, scalar end, scalar height)
: Term(name, height), _start(start), _end(end) {
}
SShape::~SShape() {
}
std::string SShape::className() const {
return "SShape";
}
scalar SShape::membership(scalar x) const {
if (fl::Op::isNaN(x)) return fl::nan;
//from Octave smf.m
scalar average = (_start + _end) / 2.0;
scalar difference = _end - _start;
if (Op::isLE(x, _start)) return _height * 0.0;
if (Op::isLE(x, average))
return _height * (2.0 * std::pow((x - _start) / difference, 2));
if (Op::isLt(x, _end))
return _height * (1.0 - 2.0 * std::pow((x - _end) / difference, 2));
return _height * 1.0;
}
std::string SShape::parameters() const {
return Op::join(2, " ", _start, _end) +
(not Op::isEq(_height, 1.0) ? " " + Op::str(_height) : "");
}
void SShape::configure(const std::string& parameters) {
if (parameters.empty()) return;
std::vector<std::string> values = Op::split(parameters, " ");
std::size_t required = 2;
if (values.size() < required) {
std::ostringstream ex;
ex << "[configuration error] term <" << className() << ">"
<< " requires <" << required << "> parameters";
throw fl::Exception(ex.str(), FL_AT);
}
setStart(Op::toScalar(values.at(0)));
setEnd(Op::toScalar(values.at(1)));
if (values.size() > required)
setHeight(Op::toScalar(values.at(required)));
}
void SShape::setStart(scalar start) {
this->_start = start;
}
scalar SShape::getStart() const {
return this->_start;
}
void SShape::setEnd(scalar end) {
this->_end = end;
}
scalar SShape::getEnd() const {
return this->_end;
}
SShape* SShape::clone() const {
return new SShape(*this);
}
Term* SShape::constructor() {
return new SShape;
}
}
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