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    package org.apache.commons.math.analysis.interpolation;
018    
019    import org.apache.commons.math.MathException;
020    import org.apache.commons.math.analysis.BivariateRealFunction;
021    
022    /**
023     * Interface representing a bivariate real interpolating function where the
024     * sample points must be specified on a regular grid.
025     *
026     * @version $Revision$ $Date$
027     */
028    public interface BivariateRealGridInterpolator {
029    
030        /**
031         * Computes an interpolating function for the data set.
032         *
033         * @param xval all the x-coordinates of the interpolation points, sorted
034         * in increasing order.
035         * @param yval all the y-coordinates of the interpolation points, sorted
036         * in increasing order.
037         * @param zval the values of the interpolation points on all the grid knots:
038         * {@code zval[i][j] = f(xval[i], yval[j])}
039         * @return a function which interpolates the data set
040         * @throws MathException if arguments violate assumptions made by the
041         *         interpolation algorithm
042         */
043        BivariateRealFunction interpolate(double[] xval, double[] yval, double[][] zval)
044            throws MathException;
045    }