commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/analysis/function/Power.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.math4.legacy.analysis.function;

import org.apache.commons.math4.legacy.analysis.differentiation.DerivativeStructure;
import org.apache.commons.math4.legacy.analysis.differentiation.UnivariateDifferentiableFunction;
import org.apache.commons.math4.legacy.core.jdkmath.AccurateMath;

/**
 * Power function.
 *
 * @since 3.0
 */
public class Power implements UnivariateDifferentiableFunction {
    /** Power. */
    private final double p;

    /**
     * @param p Power.
     */
    public Power(double p) {
        this.p = p;
    }

    /** {@inheritDoc} */
    @Override
    public double value(double x) {
        return AccurateMath.pow(x, p);
    }

    /** {@inheritDoc}
     * @since 3.1
     */
    @Override
    public DerivativeStructure value(final DerivativeStructure t) {
        return t.pow(p);
    }

}