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.math4.analysis;
019
020/**
021 * An interface representing a multivariate real function.
022 *
023 * @since 2.0
024 */
025public interface MultivariateFunction {
026
027    /**
028     * Compute the value for the function at the given point.
029     *
030     * @param point Point at which the function must be evaluated.
031     * @return the function value for the given point.
032     * @throws org.apache.commons.math4.exception.DimensionMismatchException
033     * if the parameter's dimension is wrong for the function being evaluated.
034     * @throws  org.apache.commons.math4.exception.MathIllegalArgumentException
035     * when the activated method itself can ascertain that preconditions,
036     * specified in the API expressed at the level of the activated method,
037     * have been violated.  In the vast majority of cases where Commons Math
038     * throws this exception, it is the result of argument checking of actual
039     * parameters immediately passed to a method.
040     */
041    double value(double[] point);
042}