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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/>.
+
+ fuzzyliteâ„¢ is a trademark of FuzzyLite Limited.
+
+ */
+
+#include "fl/term/SigmoidProduct.h"
+
+namespace fl {
+
+ SigmoidProduct::SigmoidProduct(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) {
+ }
+
+ SigmoidProduct::~SigmoidProduct() {
+ }
+
+ std::string SigmoidProduct::className() const {
+ return "SigmoidProduct";
+ }
+
+ scalar SigmoidProduct::membership(scalar x) const {
+ scalar a = 1.0 / (1 + std::exp(-_rising * (x - _left)));
+ scalar b = 1.0 / (1 + std::exp(-_falling * (x - _right)));
+ return _height * a * b;
+ }
+
+ std::string SigmoidProduct::parameters() const {
+ return Op::join(4, " ", _left, _rising, _falling, _right) +
+ (not Op::isEq(_height, 1.0) ? " " + Op::str(_height) : "");
+ }
+
+ void SigmoidProduct::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 SigmoidProduct::setRising(scalar risingSlope) {
+ this->_rising = risingSlope;
+ }
+
+ scalar SigmoidProduct::getRising() const {
+ return this->_rising;
+ }
+
+ void SigmoidProduct::setLeft(scalar leftInflection) {
+ this->_left = leftInflection;
+ }
+
+ scalar SigmoidProduct::getLeft() const {
+ return this->_left;
+ }
+
+ void SigmoidProduct::setRight(scalar rightInflection) {
+ this->_right = rightInflection;
+ }
+
+ scalar SigmoidProduct::getRight() const {
+ return this->_right;
+ }
+
+ void SigmoidProduct::setFalling(scalar fallingSlope) {
+ this->_falling = fallingSlope;
+ }
+
+ scalar SigmoidProduct::getFalling() const {
+ return this->_falling;
+ }
+
+ SigmoidProduct* SigmoidProduct::clone() const {
+ return new SigmoidProduct(*this);
+ }
+
+ Term* SigmoidProduct::constructor() {
+ return new SigmoidProduct;
+ }
+
+}