Java Array Max Value maxIndex(double[] v)

Description

Gets the index of the maximum element in the array.

License

Open Source License

Parameter

Parameter	Description
v	a parameter

Return

the index of the maximum element of v.

Declaration

public static int maxIndex(double[] v) 

Method Source Code

//package com.java2s;
/** A collection of mathematical utility functions.
 * <p>//from  w ww  . j a  v  a2s . co  m
 * Copyright (c) 2008 Eric Eaton
 * <p>
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * <p>
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 * @author Eric Eaton (EricEaton@umbc.edu) <br>
 *         University of Maryland Baltimore County
 *
 * @version 0.1
 *
 */

public class Main {
    /** Gets the index of the maximum element in the array.  Returns the
     * first max index if there are multiple matching elements.
     * @param v
     * @return the index of the maximum element of v.
     */
    public static int maxIndex(double[] v) {
        // error check the arguments
        if (v == null || v.length == 0) {
            throw new IllegalArgumentException("v cannot be empty.");
        }

        // set up
        double maxValue = maxValue(v);

        // determine the indices with the max value
        for (int i = 0; i < v.length; i++) {
            if (v[i] == maxValue) {
                return i;
            }
        }
        return -1; // unreachable code
    }

    /** Gets the index of the maximum element in the array.  Returns the
     * first max index if there are multiple matching elements.
     * @param v
     * @return the index of the maximum element of v.
     */
    public static int maxIndex(int[] v) {
        // error check the arguments
        if (v == null || v.length == 0) {
            throw new IllegalArgumentException("v cannot be empty.");
        }

        // set up
        int maxValue = maxValue(v);

        // determine the indices with the max value
        for (int i = 0; i < v.length; i++) {
            if (v[i] == maxValue) {
                return i;
            }
        }
        return -1; // unreachable code
    }

    /** Computes the maximum value in the given array.
     * @param values
     * @return the maximum value in the given array.
     */
    public static int maxValue(int[] values) {
        int maxValue = Integer.MIN_VALUE;
        for (int val : values) {
            maxValue = (maxValue < val) ? val : maxValue;
        }
        return maxValue;
    }

    /** Computes the maximum value in the given array.
     * @param values
     * @return the maximum value in the given array.
     */
    public static double maxValue(double[] values) {
        double maxValue = Double.MIN_VALUE;
        for (double val : values) {
            maxValue = (maxValue < val) ? val : maxValue;
        }
        return maxValue;
    }
}

Related

1. maxIndex(double[] array)
2. maxIndex(double[] arrays)
3. maxIndex(double[] doubles)
4. maxIndex(double[] doubles)
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6. maxIndex(double[] value)
7. maxIndex(double[] x, int length)
8. maxIndex(final double[] a)
9. maxIndex(final double[] values)