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Java 计算两个数组的标量积，就好像它们是向量一样。

欢马劈雪

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计算两个数组的标量积，就好像它们是矢量一样。

实例源码：

源代码：

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//package com.nowjava;

public class Main {
/**
时代Java - N o w  J a v a . c o m 提供 
**/

public static void main(String[] argv) throws Exception {

double[] w0 = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000,

37.1234, 67.2344, 68.34534, 69.87700 };

double[] w1 = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000,

37.1234, 67.2344, 68.34534, 69.87700 };

System.out.println(scalarProduct(w0, w1));

}

/**

* Computes the scalar product of two array as if they were vectors.

* @throws IllegalArgumentException if the don't have the same length

public static double scalarProduct(double[] w0, double[] w1) {

if (w0.length != w1.length) {

throw new IllegalArgumentException(

"Arrays must have the same length : " + w0.length

+ ", " + w1.length);

}

if (w0.length == 0)

throw new IllegalArgumentException(//时 代 J     a    v  a - nowjava.com 提供

"Nothing to compute! Arrays must have at least one element.");

double sortie = 0.0;

for (int k = 0; k < w0.length; k++) {

sortie += w0[k] * w1[k];

}

return (sortie);

}

/**

* Computes the scalar product of two array as if they were matrices.

* @throws IllegalArgumentException if the don't have the same length

public static double scalarProduct(double[][] w0, double[][] w1) {

if (w0.length != w1.length) {

throw new IllegalArgumentException(

"Arrays must have the same length : " + w0.length

+ ", " + w1.length);

}

if (w0.length == 0)

throw new IllegalArgumentException(

"Nothing to compute! Arrays must have at least one element.");

double sortie = 0.0;

for (int k = 0; k < w0.length; k++) {

sortie = sortie + scalarProduct(w0[k], w1[k]);

}

return (sortie);

}

/**

* Computes the scalar product of two array

* as if they were vectors.

* @throws IllegalArgumentException if the

*                                  don't have the same length.

public static int scalarProduct(int[] w0, int[] w1) {

if (w0.length != w1.length) {

throw new IllegalArgumentException(

"Arrays must have the same length : " + w0.length

+ ", " + w1.length);

}

if (w0.length == 0)

throw new IllegalArgumentException(

"Nothing to compute! Arrays must have at least one element.");

int sortie = 0;

for (int k = 0; k < w0.length; k++) {

sortie = sortie + w0[k] * w1[k];

}

return (sortie);

}

/**

* Computes the scalar product of two array

* as if they were matrices.

* @throws IllegalArgumentException if the

*                                  don't have the same length.

*/
/**代码未完, 请加载全部代码(NowJava.com).**/

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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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