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diff --git a/fuzzylite/src/term/PiShape.cpp b/fuzzylite/src/term/PiShape.cpp
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+++ b/fuzzylite/src/term/PiShape.cpp
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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/PiShape.h"
+
+namespace fl {
+
+    PiShape::PiShape(const std::string& name, scalar bottomLeft, scalar topLeft,
+            scalar topRight, scalar bottomRight, scalar height)
+    : Term(name, height), _bottomLeft(bottomLeft), _topLeft(topLeft),
+    _topRight(topRight), _bottomRight(bottomRight) {
+    }
+
+    PiShape::~PiShape() {
+    }
+
+    std::string PiShape::className() const {
+        return "PiShape";
+    }
+
+    scalar PiShape::membership(scalar x) const {
+        if (fl::Op::isNaN(x)) return fl::nan;
+        //from Octave smf.m
+        scalar a_b_ave = (_bottomLeft + _topLeft) / 2.0;
+        scalar b_minus_a = _topLeft - _bottomLeft;
+        scalar c_d_ave = (_topRight + _bottomRight) / 2.0;
+        scalar d_minus_c = _bottomRight - _topRight;
+
+        if (Op::isLE(x, _bottomLeft)) return _height * 0.0;
+
+        if (Op::isLE(x, a_b_ave))
+            return _height * (2.0 * std::pow((x - _bottomLeft) / b_minus_a, 2));
+
+        if (Op::isLt(x, _topLeft))
+            return _height * (1.0 - 2.0 * std::pow((x - _topLeft) / b_minus_a, 2));
+
+        if (Op::isLE(x, _topRight))
+            return _height * 1.0;
+
+        if (Op::isLE(x, c_d_ave))
+            return _height * (1.0 - 2.0 * std::pow((x - _topRight) / d_minus_c, 2));
+
+        if (Op::isLt(x, _bottomRight))
+            return _height * (2.0 * std::pow((x - _bottomRight) / d_minus_c, 2));
+
+        return _height * 0.0;
+    }
+
+    std::string PiShape::parameters() const {
+        return Op::join(4, " ", _bottomLeft, _topLeft, _topRight, _bottomRight) +
+                (not Op::isEq(_height, 1.0) ? " " + Op::str(_height) : "");
+    }
+
+    void PiShape::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);
+        }
+        setBottomLeft(Op::toScalar(values.at(0)));
+        setTopLeft(Op::toScalar(values.at(1)));
+        setTopRight(Op::toScalar(values.at(2)));
+        setBottomRight(Op::toScalar(values.at(3)));
+        if (values.size() > required)
+            setHeight(Op::toScalar(values.at(required)));
+    }
+
+    void PiShape::setBottomLeft(scalar a) {
+        this->_bottomLeft = a;
+    }
+
+    scalar PiShape::getBottomLeft() const {
+        return this->_bottomLeft;
+    }
+
+    void PiShape::setTopLeft(scalar b) {
+        this->_topLeft = b;
+    }
+
+    scalar PiShape::getTopLeft() const {
+        return this->_topLeft;
+    }
+
+    void PiShape::setTopRight(scalar d) {
+        this->_topRight = d;
+    }
+
+    scalar PiShape::getTopRight() const {
+        return this->_topRight;
+    }
+
+    void PiShape::setBottomRight(scalar c) {
+        this->_bottomRight = c;
+    }
+
+    scalar PiShape::getBottomRight() const {
+        return this->_bottomRight;
+    }
+
+    PiShape* PiShape::clone() const {
+        return new PiShape(*this);
+    }
+
+    Term* PiShape::constructor() {
+        return new PiShape;
+    }
+
+}