/**
* Copyright (C) 2001-2017 by RapidMiner and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapidminer.com
*
* This program is free software: you can redistribute it and/or modify it under the terms of the
* GNU Affero General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* This program 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
* Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License along with this program.
* If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.tools.expression.internal.function.trigonometric;
import com.rapidminer.tools.Ontology;
import com.rapidminer.tools.expression.ExpressionType;
import com.rapidminer.tools.expression.FunctionInputException;
import com.rapidminer.tools.expression.internal.function.Abstract2DoubleInputFunction;
/**
*
* A {@link Function} computing the trigonometric arc tangent of two values.
*
* @author Denis Schernov
*
*/
public class ArcTangent2 extends Abstract2DoubleInputFunction {
public ArcTangent2() {
super("trigonometrical.atan2", 2, Ontology.NUMERICAL);
}
@Override
protected double compute(double value1, double value2) {
return Double.isNaN(value1) || Double.isNaN(value2) ? Double.NaN : Math.atan2(value1, value2);
}
@Override
protected ExpressionType computeType(ExpressionType... inputTypes) {
ExpressionType left = inputTypes[0];
ExpressionType right = inputTypes[1];
if ((left == ExpressionType.INTEGER || left == ExpressionType.DOUBLE)
&& (right == ExpressionType.INTEGER || right == ExpressionType.DOUBLE)) {
return ExpressionType.DOUBLE;
} else {
throw new FunctionInputException("expression_parser.function_wrong_type", getFunctionName(), "numerical");
}
}
}