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.math3.analysis.interpolation;
018    
019    import org.apache.commons.math3.analysis.BivariateFunction;
020    import org.apache.commons.math3.exception.DimensionMismatchException;
021    import org.apache.commons.math3.exception.NoDataException;
022    import org.apache.commons.math3.exception.NonMonotonicSequenceException;
023    import org.apache.commons.math3.exception.NumberIsTooSmallException;
024    
025    /**
026     * Interface representing a bivariate real interpolating function where the
027     * sample points must be specified on a regular grid.
028     *
029     * @version $Id: BivariateGridInterpolator.java 1455194 2013-03-11 15:45:54Z luc $
030     */
031    public interface BivariateGridInterpolator {
032        /**
033         * Compute an interpolating function for the dataset.
034         *
035         * @param xval All the x-coordinates of the interpolation points, sorted
036         * in increasing order.
037         * @param yval All the y-coordinates of the interpolation points, sorted
038         * in increasing order.
039         * @param fval The values of the interpolation points on all the grid knots:
040         * {@code fval[i][j] = f(xval[i], yval[j])}.
041         * @return a function which interpolates the dataset.
042         * @throws NoDataException if any of the arrays has zero length.
043         * @throws DimensionMismatchException if the array lengths are inconsistent.
044         * @throws NonMonotonicSequenceException if the array is not sorted.
045         * @throws NumberIsTooSmallException if the number of points is too small for
046         * the order of the interpolation
047         */
048        BivariateFunction interpolate(double[] xval, double[] yval,
049                                      double[][] fval)
050            throws NoDataException, DimensionMismatchException,
051                   NonMonotonicSequenceException, NumberIsTooSmallException;
052    }