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Java example source code file (PivotingStrategyInterface.java)

This example Java source code file (PivotingStrategyInterface.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

mathillegalargumentexception, pivotingstrategyinterface

The PivotingStrategyInterface.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 org.apache.commons.math3.exception.MathIllegalArgumentException;


/**
 * A strategy to pick a pivoting index of an array for doing partitioning.
 * @see MedianOf3PivotingStrategy
 * @see RandomPivotingStrategy
 * @see CentralPivotingStrategy
 * @since 3.4
 */
public interface PivotingStrategyInterface {

    /**
     * Find pivot index of the array so that partition and K<sup>th
     * element selection can be made
     * @param work data array
     * @param begin index of the first element of the slice
     * @param end index after the last element of the slice
     * @return the index of the pivot element chosen between the
     * first and the last element of the array slice
     * @throws MathIllegalArgumentException when indices exceeds range
     */
    int pivotIndex(double[] work, int begin, int end)
        throws MathIllegalArgumentException;

}

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