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95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
/* Copyright 2010 Juan Rada-Vilela
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "FunctionTerm.h"
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namespace fl {
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FunctionTerm::FunctionTerm() : LinguisticTerm() {
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_ip.loadMathOperators();
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}
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FunctionTerm::FunctionTerm(const std::string& name, const std::string& f_infix,
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flScalar minimum, flScalar maximum)
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: LinguisticTerm(name, minimum, maximum) {
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_ip.loadMathOperators();
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setInfixFunction(f_infix);
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}
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FunctionTerm::FunctionTerm(const FuzzyOperator& fuzzy_op, const std::string& name,
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const std::string& f_infix, flScalar minimum, flScalar maximum)
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: LinguisticTerm(fuzzy_op, name, minimum, maximum) {
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_ip.loadMathOperators();
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setInfixFunction(f_infix);
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}
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FunctionTerm::~FunctionTerm() {
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}
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void FunctionTerm::setInfixFunction(const std::string& infix) {
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this->_infix_function = infix;
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setPostfixFunction(_ip.transform(infix));
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}
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std::string FunctionTerm::infixFunction() const {
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return this->_infix_function;
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}
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void FunctionTerm::setPostfixFunction(const std::string& postfix) {
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this->_postfix_function = postfix;
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}
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std::string FunctionTerm::postfixFunction() const {
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return this->_postfix_function;
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}
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bool FunctionTerm::isValid() const {
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std::map<std::string, flScalar> x;
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x["x"] = 0;
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x["min"] = minimum();
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x["max"] = maximum();
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try {
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_ip.evaluate(postfixFunction(), &x);
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return true;
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} catch (std::exception ex) {
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return false;
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}
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}
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flScalar FunctionTerm::membership(flScalar crisp) const {
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std::map<std::string, flScalar> m;
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m["x"] = crisp;
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m["min"] = minimum();
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m["max"] = maximum();
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return _ip.evaluate(postfixFunction(), &m);
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}
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FunctionTerm* FunctionTerm::clone() const {
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return new FunctionTerm(*this);
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}
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LinguisticTerm::eMembershipFunction FunctionTerm::type() const {
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return MF_FUNCTION;
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}
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std::string FunctionTerm::toString() const {
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std::stringstream ss;
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ss << LinguisticTerm::toString();
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ss << "Function f = " << postfixFunction() << " | x=[" << minimum() << " " << maximum() << "]";
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return ss.str();
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}
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}
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