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Diffstat (limited to 'fuzzylite/src/term/SigmoidDifference.cpp')
-rw-r--r-- | fuzzylite/src/term/SigmoidDifference.cpp | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/fuzzylite/src/term/SigmoidDifference.cpp b/fuzzylite/src/term/SigmoidDifference.cpp new file mode 100644 index 0000000..55a586c --- /dev/null +++ b/fuzzylite/src/term/SigmoidDifference.cpp @@ -0,0 +1,114 @@ +/* + 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/>. + + fuzzyliteâ„¢ is a trademark of FuzzyLite Limited. + + */ + +#include "fl/term/SigmoidDifference.h" + +namespace fl { + + SigmoidDifference::SigmoidDifference(const std::string& name, + scalar left, scalar rising, + scalar falling, scalar right, scalar height) + : Term(name, height), _left(left), _rising(rising), _falling(falling), _right(right) { + } + + SigmoidDifference::~SigmoidDifference() { + } + + std::string SigmoidDifference::className() const { + return "SigmoidDifference"; + } + + scalar SigmoidDifference::membership(scalar x) const { + if (fl::Op::isNaN(x)) return fl::nan; + + scalar a = 1.0 / (1 + std::exp(-_rising * (x - _left))); + scalar b = 1.0 / (1 + std::exp(-_falling * (x - _right))); + return _height * std::abs(a - b); + } + + std::string SigmoidDifference::parameters() const { + return Op::join(4, " ", _left, _rising, _falling, _right) + + (not Op::isEq(_height, 1.0) ? " " + Op::str(_height) : ""); + } + + void SigmoidDifference::configure(const std::string& parameters) { + if (parameters.empty()) return; + std::vector<std::string> values = Op::split(parameters, " "); + std::size_t required = 4; + if (values.size() < required) { + std::ostringstream ex; + ex << "[configuration error] term <" << className() << ">" + << " requires <" << required << "> parameters"; + throw fl::Exception(ex.str(), FL_AT); + } + setLeft(Op::toScalar(values.at(0))); + setRising(Op::toScalar(values.at(1))); + setFalling(Op::toScalar(values.at(2))); + setRight(Op::toScalar(values.at(3))); + if (values.size() > required) + setHeight(Op::toScalar(values.at(required))); + } + + void SigmoidDifference::setLeft(scalar leftInflection) { + this->_left = leftInflection; + } + + scalar SigmoidDifference::getLeft() const { + return this->_left; + } + + void SigmoidDifference::setRising(scalar risingSlope) { + this->_rising = risingSlope; + } + + scalar SigmoidDifference::getRising() const { + return this->_rising; + } + + void SigmoidDifference::setFalling(scalar fallingSlope) { + this->_falling = fallingSlope; + } + + scalar SigmoidDifference::getFalling() const { + return this->_falling; + } + + void SigmoidDifference::setRight(scalar rightInflection) { + this->_right = rightInflection; + } + + scalar SigmoidDifference::getRight() const { + return this->_right; + } + + SigmoidDifference* SigmoidDifference::clone() const { + return new SigmoidDifference(*this); + } + + Term* SigmoidDifference::constructor() { + return new SigmoidDifference; + } + + +} |