Java 计算双数组的平均值
计算双精度数组的平均值
实例源码：
源代码：
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/*3
N o w J a v a . c o m 提供4
*/5
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//package com.nowjava;7
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public class Main {10
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public static void main(String[] argv) throws Exception {12
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double[] v = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000,14
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37.1234, 67.2344, 68.34534, 69.87700 };16
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System.out.println(mean(v));18
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}20
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/**23
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* Computes the mean.25
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*/27
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public static double mean(double[] v) {29
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if (v.length == 0)31
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throw new IllegalArgumentException(33
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"Nothing to compute! The array must have at least one element.");35
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return (mass(v) / (double) v.length);37
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}/*来自 时代Java*/39
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/**42
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* Computes the mean.44
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*/46
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public static double mean(int[] v) {48
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if (v.length == 0)50
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throw new IllegalArgumentException(52
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"Nothing to compute! The array must have at least one element.");54
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return (mass(v) / (double) v.length);56
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}58
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/**61
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* Returns the sum of the elements of the array.63
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*/65
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public static double mass(double[] v) {67
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double somme = 0.0;69
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for (int k = 0; k < v.length; k++) {71
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somme += v[k];73
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}75
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return (somme);77
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}79
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/**82
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