Java mean mean(Number[] array)

Description

Returns the mean of the given array.

License

Open Source License

Parameter

Parameter	Description
array	the array to work on

Return

the mean

Declaration

public static double mean(Number[] array) 

Method Source Code

//package com.java2s;
/*/*from   w  w  w .  j a v a  2s.  c  om*/
 *   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/>.
 */

public class Main {
    /**
     * Returns the mean of the given array.
     * NaN is returned in case of zero-length arrays.
     *
     * @param array   the array to work on
     * @return      the mean
     */
    public static double mean(Number[] array) {
        double result;
        int i;

        if (array.length == 0)
            return Double.NaN;

        result = 0;

        for (i = 0; i < array.length; i++)
            result += array[i].doubleValue();

        result /= array.length;

        return result;
    }

    /**
     * Returns the mean of the given array.
     * NaN is returned in case of zero-length arrays.
     *
     * @param array   the array to work on
     * @return      the mean
     */
    public static double mean(int[] array) {
        return mean(toNumberArray(array));
    }

    /**
     * Returns the mean of the given array.
     * NaN is returned in case of zero-length arrays.
     *
     * @param array   the array to work on
     * @return      the mean
     */
    public static double mean(double[] array) {
        return mean(toNumberArray(array));
    }

    /**
     * Turns the byte array into a Byte array.
     *
     * @param array   the array to convert
     * @return      the converted array
     */
    public static Number[] toNumberArray(byte[] array) {
        Byte[] result;
        int i;

        result = new Byte[array.length];
        for (i = 0; i < array.length; i++)
            result[i] = new Byte(array[i]);

        return result;
    }

    /**
     * Turns the short array into a Short array.
     *
     * @param array   the array to convert
     * @return      the converted array
     */
    public static Number[] toNumberArray(short[] array) {
        Short[] result;
        int i;

        result = new Short[array.length];
        for (i = 0; i < array.length; i++)
            result[i] = new Short(array[i]);

        return result;
    }

    /**
     * Turns the int array into a Integer array.
     *
     * @param array   the array to convert
     * @return      the converted array
     */
    public static Number[] toNumberArray(int[] array) {
        Integer[] result;
        int i;

        result = new Integer[array.length];
        for (i = 0; i < array.length; i++)
            result[i] = new Integer(array[i]);

        return result;
    }

    /**
     * Turns the long array into a Long array.
     *
     * @param array   the array to convert
     * @return      the converted array
     */
    public static Number[] toNumberArray(long[] array) {
        Long[] result;
        int i;

        result = new Long[array.length];
        for (i = 0; i < array.length; i++)
            result[i] = new Long(array[i]);

        return result;
    }

    /**
     * Turns the float array into a Float array.
     *
     * @param array   the array to convert
     * @return      the converted array
     */
    public static Number[] toNumberArray(float[] array) {
        Float[] result;
        int i;

        result = new Float[array.length];
        for (i = 0; i < array.length; i++)
            result[i] = new Float(array[i]);

        return result;
    }

    /**
     * Turns the double array into a Double array.
     *
     * @param array   the array to convert
     * @return      the converted array
     */
    public static Number[] toNumberArray(double[] array) {
        Double[] result;
        int i;

        result = new Double[array.length];
        for (i = 0; i < array.length; i++)
            result[i] = new Double(array[i]);

        return result;
    }
}

Related

1. mean(int[] values, int max)
2. mean(Integer[] values)
3. mean(List a)
4. mean(List values)
5. mean(long[] values)
6. Mean(Object in)
7. mean_Integer(List values)
8. meanAbortedExecutionTime( double totalExecutionTime, int totalOps, double granuleAbortProb)
9. meanAndStandardDeviation(final double[] inp, final int startIndex, final int pastEnd)