1 files changed, 107 insertions, 0 deletions
diff --git a/fuzzylite/src/term/Concave.cpp b/fuzzylite/src/term/Concave.cpp
new file mode 100644
index 0000000..37679ae
--- /dev/null
+++ b/fuzzylite/src/term/Concave.cpp
@@ -0,0 +1,107 @@
+/*
+ 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/Concave.h"
+
+namespace fl {
+
+    Concave::Concave(const std::string& name, scalar inflection, scalar end, scalar height)
+    : Term(name, height), _inflection(inflection), _end(end) {
+
+    }
+
+    Concave::~Concave() {
+
+    }
+
+    std::string Concave::className() const {
+        return "Concave";
+    }
+
+    scalar Concave::membership(scalar x) const {
+        if (fl::Op::isNaN(x)) return fl::nan;
+        if (fl::Op::isLE(_inflection, _end)) { //Concave increasing
+            if (fl::Op::isLt(x, _end)) {
+                return _height * (_end - _inflection) / (2 * _end - _inflection - x);
+            }
+        } else { //Concave decreasing
+            if (fl::Op::isGt(x, _end)) {
+                return _height * (_inflection - _end) / (_inflection - 2 * _end + x);
+            }
+        }
+        return _height * 1.0;
+    }
+
+    std::string Concave::parameters() const {
+        return Op::join(2, " ", _inflection, _end) +
+                (not Op::isEq(_height, 1.0) ? " " + Op::str(_height) : "");
+
+    }
+
+    void Concave::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);
+        }
+        setInflection(Op::toScalar(values.at(0)));
+        setEnd(Op::toScalar(values.at(1)));
+        if (values.size() > required)
+            setHeight(Op::toScalar(values.at(required)));
+
+    }
+
+    void Concave::setInflection(scalar start) {
+        this->_inflection = start;
+    }
+
+    scalar Concave::getInflection() const {
+        return this->_inflection;
+    }
+
+    void Concave::setEnd(scalar end) {
+        this->_end = end;
+    }
+
+    scalar Concave::getEnd() const {
+        return this->_end;
+    }
+
+    Concave* Concave::clone() const {
+        return new Concave(*this);
+    }
+
+    Term* Concave::constructor() {
+        return new Concave;
+    }
+
+
+
+
+
+}