Java BigDecimal Calculate calculateArithmeticMean(BigDecimal[] values)

Description

Get the arithmetic mean for a set of values.

License

Apache License

Parameter

Parameter	Description
values	a parameter

Return

The arithmetic mean.

Declaration

private static BigDecimal calculateArithmeticMean(BigDecimal[] values) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.math.BigDecimal;

public class Main {
    /**/*from www  .  ja  va2  s.  com*/
     * The scale for calculations with BigDecimal.
     */
    private static final int DECIMAL_SCALE = 10;

    /**
     * Get the arithmetic mean for a set of values. Using BigDecimal for exact
     * results.
     * 
     * @param values
     * @return The arithmetic mean.
     */
    private static BigDecimal calculateArithmeticMean(BigDecimal[] values) {
        if (values.length == 1) {
            return values[0].setScale(DECIMAL_SCALE, BigDecimal.ROUND_HALF_UP);
        }
        BigDecimal arithmeticMean = BigDecimal.valueOf(0d);
        for (BigDecimal value : values) {
            arithmeticMean = arithmeticMean.add(value);
        }
        arithmeticMean = arithmeticMean.divide(BigDecimal.valueOf(values.length), DECIMAL_SCALE,
                BigDecimal.ROUND_HALF_UP);
        return arithmeticMean;
    }

    /**
     * Get the arithmetic mean for a set of values. Using BigDecimal for exact
     * results.
     * 
     * @param values
     * @return The arithmetic mean.
     */
    public static double calculateArithmeticMean(double[] values) {
        BigDecimal[] valuesBigD = new BigDecimal[values.length];
        for (int i = 0; i < values.length; i++) {
            valuesBigD[i] = BigDecimal.valueOf(values[i]);
        }
        return calculateArithmeticMean(valuesBigD).doubleValue();
    }
}

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