    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one or more
    003     * contributor license agreements.  See the NOTICE file distributed with
    004     * this work for additional information regarding copyright ownership.
    005     * The ASF licenses this file to You under the Apache License, Version 2.0
    006     * (the "License"); you may not use this file except in compliance with
    007     * the License.  You may obtain a copy of the License at
    008     *
    009     *      http://www.apache.org/licenses/LICENSE-2.0
    010     *
    011     * Unless required by applicable law or agreed to in writing, software
    012     * distributed under the License is distributed on an "AS IS" BASIS,
    013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014     * See the License for the specific language governing permissions and
    015     * limitations under the License.
    016     */
    017
    018    package org.apache.commons.math3.analysis;
    019
    020    /**
    021     * An interface representing a real function that depends on one independent
    022     * variable plus some extra parameters.
    023     *
    024     * @since 3.0
    025     * @version $Id: ParametricUnivariateFunction.java 1364387 2012-07-22 18:14:11Z tn $
    026     */
    027    public interface ParametricUnivariateFunction {
    028        /**
    029         * Compute the value of the function.
    030         *
    031         * @param x Point for which the function value should be computed.
    032         * @param parameters Function parameters.
    033         * @return the value.
    034         */
    035        double value(double x, double ... parameters);
    036
    037        /**
    038         * Compute the gradient of the function with respect to its parameters.
    039         *
    040         * @param x Point for which the function value should be computed.
    041         * @param parameters Function parameters.
    042         * @return the value.
    043         */
    044        double[] gradient(double x, double ... parameters);
    045    }