/* Copyright 2009-2015 David Hadka
*
* This file is part of the MOEA Framework.
*
* The MOEA Framework 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.
*
* The MOEA Framework 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 the MOEA Framework. If not, see <http://www.gnu.org/licenses/>.
*/
package org.moeaframework.util.tree;
/**
* The node for calculating the result of Euler's number <i>e</i> raised to the
* power of a number. The inputs and outputs to this node are shown below:
*
* <table border="1" cellpadding="3" cellspacing="0">
* <tr class="TableHeadingColor">
* <th width="25%" align="left">Name</th>
* <th width="25%" align="left">Type</th>
* <th width="50%" align="left">Description</th>
* </tr>
* <tr>
* <td>Argument 1</td>
* <td>Number</td>
* <td>The number</td>
* </tr>
* <tr>
* <td>Return Value</td>
* <td>Number</td>
* <td>The exponential function value given the number</td>
* </tr>
* </table>
*
* @see Math#exp(double)
*/
public class Exp extends Node {
/**
* Constructs a new node for calculating the result of Euler's number
* <i>e</i> raised to the power of a number.
*/
public Exp() {
super(Number.class, Number.class);
}
@Override
public Exp copyNode() {
return new Exp();
}
@Override
public Number evaluate(Environment environment) {
return NumberArithmetic.exp(
(Number)getArgument(0).evaluate(environment));
}
}