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Java example source code file (MedianOf3PivotingStrategy.java)
The MedianOf3PivotingStrategy.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/LICENSE-2.0 * * 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.util; import java.io.Serializable; import org.apache.commons.math3.exception.MathIllegalArgumentException; /** * Classic median of 3 strategy given begin and end indices. * @since 3.4 */ public class MedianOf3PivotingStrategy implements PivotingStrategyInterface, Serializable { /** Serializable UID. */ private static final long serialVersionUID = 20140713L; /**{@inheritDoc} * This in specific makes use of median of 3 pivoting. * @return The index corresponding to a pivot chosen between the * first, middle and the last indices of the array slice * @throws MathIllegalArgumentException when indices exceeds range */ public int pivotIndex(final double[] work, final int begin, final int end) throws MathIllegalArgumentException { MathArrays.verifyValues(work, begin, end-begin); final int inclusiveEnd = end - 1; final int middle = begin + (inclusiveEnd - begin) / 2; final double wBegin = work[begin]; final double wMiddle = work[middle]; final double wEnd = work[inclusiveEnd]; if (wBegin < wMiddle) { if (wMiddle < wEnd) { return middle; } else { return wBegin < wEnd ? inclusiveEnd : begin; } } else { if (wBegin < wEnd) { return begin; } else { return wMiddle < wEnd ? inclusiveEnd : middle; } } } } Other Java examples (source code examples)Here is a short list of links related to this Java MedianOf3PivotingStrategy.java source code file: |
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