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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/Linear.h"
#include "fl/Engine.h"
#include "fl/variable/InputVariable.h"
#include <cstdarg>
namespace fl {
Linear::Linear(const std::string& name,
const std::vector<scalar>& coefficients,
const Engine* engine)
: Term(name), _coefficients(coefficients), _engine(engine) {
}
Linear::~Linear() {
}
std::string Linear::className() const {
return "Linear";
}
scalar Linear::membership(scalar x) const {
(void) x;
if (not _engine) throw fl::Exception("[linear error] term <" + getName() + "> "
"is missing a reference to the engine", FL_AT);
scalar result = 0.0;
for (std::size_t i = 0; i < _engine->inputVariables().size(); ++i) {
if (i < _coefficients.size())
result += _coefficients.at(i) * _engine->inputVariables().at(i)->getInputValue();
}
if (_coefficients.size() > _engine->inputVariables().size()) {
result += _coefficients.back();
}
return result;
}
void Linear::set(const std::vector<scalar>& coeffs, const Engine* engine) {
setCoefficients(coeffs);
setEngine(engine);
}
void Linear::setCoefficients(const std::vector<scalar>& coeffs) {
this->_coefficients = coeffs;
}
const std::vector<scalar>& Linear::coefficients() const {
return this->_coefficients;
}
std::vector<scalar>& Linear::coefficients() {
return this->_coefficients;
}
void Linear::setEngine(const Engine* engine) {
this->_engine = engine;
}
const Engine* Linear::getEngine() const {
return this->_engine;
}
std::string Linear::parameters() const {
return Op::join(this->_coefficients, " ");
}
void Linear::configure(const std::string& parameters) {
if (parameters.empty()) return;
std::vector<std::string> strValues = Op::split(parameters, " ");
std::vector<scalar> values;
for (std::size_t i = 0; i < strValues.size(); ++i) {
values.push_back(Op::toScalar(strValues.at(i)));
}
this->_coefficients = values;
}
Linear* Linear::clone() const {
return new Linear(*this);
}
Term* Linear::constructor() {
return new Linear;
}
template <typename T>
Linear* Linear::create(const std::string& name,
const Engine* engine, T firstCoefficient, ...) {// throw (fl::Exception) {
if (not engine) throw fl::Exception("[linear error] cannot create term <" + name + "> "
"without a reference to the engine", FL_AT);
std::vector<scalar> coefficients;
coefficients.push_back(firstCoefficient);
va_list args;
va_start(args, firstCoefficient);
for (std::size_t i = 0; i < engine->inputVariables().size(); ++i) {
coefficients.push_back((scalar) va_arg(args, T));
}
va_end(args);
return new Linear(name, coefficients, engine);
}
template FL_API Linear* Linear::create(const std::string& name,
const Engine* engine,
double firstCoefficient, ...);
template FL_API Linear* Linear::create(const std::string& name,
const Engine* engine,
int firstCoefficient, ...);
}
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