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 }