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Java 重新规范化数组，使其L2范数为1（直至计算错误）。

欢马劈雪

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重新规范化数组，使其L2范数为1（直至计算错误）。

实例源码：

源代码：

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//package com.nowjava;

/*
来 自*
 NowJava.com
*/

public class Main {

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

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

37.1234, 67.2344, 68.34534, 69.87700 };

System.out.println(java.util.Arrays.toString(normalize(v)));

}

/**

* Renormalizes the array so that its L2 norm is 1

* (up to computational errors).

public static double[] normalize(double[] v) {

return (scalarMultiply(1.0 / norm(v), v));

}

/**

* Returns a comma delimited string representing the value of the array.

public static String toString(double[] array) {

StringBuffer buf = new StringBuffer(array.length);

int i;
        /*
        来 自*
         N o  w  J a v a . c o m - 时  代  Java
        */

for (i = 0; i < array.length - 1; i++) {

buf.append(array[i]);

buf.append(',');

}

buf.append(array[i]);

return buf.toString();

}

/**

* Returns a comma delimited string representing the value of the array.

public static String toString(double[][] array) {

StringBuffer buf = new StringBuffer();

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

buf.append(toString(array[k]));

buf.append(System.getProperty("line.separator"));

}

return buf.toString();

}

/**

* Returns a comma delimited string representing the value of the array.

public static String toString(int[] array) {

StringBuffer buf = new StringBuffer(array.length);

int i;

for (i = 0; i < array.length - 1; i++) {

buf.append(array[i]);

buf.append(',');

}

buf.append(array[i]);

return buf.toString();

}

/**

* Returns a comma delimited string representing the value of the array.

public static String toString(int[][] array) {

StringBuffer buf = new StringBuffer();

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

buf.append(toString(array[k]));

buf.append(System.getProperty("line.separator"));

}

return buf.toString();

}

/**

* Multiplies every component of an array by a scalar.

public static double[] scalarMultiply(double a, double[] v) {

double[] ans = new double[v.length];

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

ans[k] = a * v[k];

}

return (ans);

}

/**

* Multiplies every component of an array by a scalar.

public static double[] scalarMultiply(double a, int[] v) {

double[] ans = new double[v.length];

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

ans[k] = v[k] * a;

}

return (ans);

}

/**

* Computes the L2 norm of an array (Euclidean norm or "length").

public static double norm(double[] data) {

return (Math.sqrt(sumSquares(data)));

}

/**

* Computes the L2 norm of an array (Euclidean norm or "length").

public static double norm(int[] data) {

return (Math.sqrt(sumSquares(data)));

}

/**

* Sums the squares of all components;

* also called the energy of the array.

public static double sumSquares(double[] data) {

double ans = 0.0;

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

ans += data[k] * data[k];

}

return (ans);

}

/**

* Sums the squares of all components;

* also called the energy of the array.

public static double sumSquares(double[][] data) {

double ans = 0.0;

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

for (int l = 0; l < data[k].length; l++) {

ans += data[k][l] * data[k][l];

}

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

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