com.rapidminer.tools.expression.internal.function.trigonometric.ArcHyperbolicCosine.java Source code

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Here is the source code for com.rapidminer.tools.expression.internal.function.trigonometric.ArcHyperbolicCosine.java

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/**
 * Copyright (C) 2001-2015 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 org.apache.commons.math3.util.FastMath;

import com.rapidminer.tools.Ontology;
import com.rapidminer.tools.expression.internal.function.Abstract1DoubleInputFunction;

/**
 *
 * A {@link Function} computing the trigonometric arc hyperbolic cosine of an angle.
 *
 * @author Denis Schernov
 *
 */
public class ArcHyperbolicCosine extends Abstract1DoubleInputFunction {

    public ArcHyperbolicCosine() {
        super("trigonometrical.acosh", Ontology.NUMERICAL);
    }

    @Override
    protected double compute(double value) {
        return Double.isNaN(value) ? Double.NaN : FastMath.acosh(value);
    }
}