

Java example source code file (LinearInterpolator.java)
The LinearInterpolator.java Java example source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.math3.analysis.interpolation; import org.apache.commons.math3.analysis.polynomials.PolynomialFunction; import org.apache.commons.math3.analysis.polynomials.PolynomialSplineFunction; import org.apache.commons.math3.util.MathArrays; import org.apache.commons.math3.exception.DimensionMismatchException; import org.apache.commons.math3.exception.NumberIsTooSmallException; import org.apache.commons.math3.exception.NonMonotonicSequenceException; import org.apache.commons.math3.exception.util.LocalizedFormats; /** * Implements a linear function for interpolation of real univariate functions. * */ public class LinearInterpolator implements UnivariateInterpolator { /** * Computes a linear interpolating function for the data set. * * @param x the arguments for the interpolation points * @param y the values for the interpolation points * @return a function which interpolates the data set * @throws DimensionMismatchException if {@code x} and {@code y} * have different sizes. * @throws NonMonotonicSequenceException if {@code x} is not sorted in * strict increasing order. * @throws NumberIsTooSmallException if the size of {@code x} is smaller * than 2. */ public PolynomialSplineFunction interpolate(double x[], double y[]) throws DimensionMismatchException, NumberIsTooSmallException, NonMonotonicSequenceException { if (x.length != y.length) { throw new DimensionMismatchException(x.length, y.length); } if (x.length < 2) { throw new NumberIsTooSmallException(LocalizedFormats.NUMBER_OF_POINTS, x.length, 2, true); } // Number of intervals. The number of data points is n + 1. int n = x.length  1; MathArrays.checkOrder(x); // Slope of the lines between the datapoints. final double m[] = new double[n]; for (int i = 0; i < n; i++) { m[i] = (y[i + 1]  y[i]) / (x[i + 1]  x[i]); } final PolynomialFunction polynomials[] = new PolynomialFunction[n]; final double coefficients[] = new double[2]; for (int i = 0; i < n; i++) { coefficients[0] = y[i]; coefficients[1] = m[i]; polynomials[i] = new PolynomialFunction(coefficients); } return new PolynomialSplineFunction(x, polynomials); } } Other Java examples (source code examples)Here is a short list of links related to this Java LinearInterpolator.java source code file: 
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