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
018package 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 */
027public 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}