Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 *   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.
 *
 *   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.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.Arrays;

public class Main {
    /**
     * Returns the 'percentile' value in array
     * @param array   A {@code double} array 
     * @param percentile The percentile value to obtain between 0-1
     * @return returns value at {@code percentile} in {@code array}
     * */
    public static double percentile(double[] array, double percentile) {
        Arrays.sort(array);
        if (array.length == 0 || percentile < 0 || percentile > 1)
            throw new IllegalArgumentException();
        double k = (array.length - 1) * percentile;
        double f = Math.floor(k);
        double c = Math.ceil(k);
        if (f == c)
            return array[(int) k];
        return array[(int) f] * (c - k) + array[(int) c] * (k - f);
    }
}