时代Java

Java 添加到数组w，a乘以v，其中a是标量。

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添加到数组w，a乘以v，其中a是标量。

实例源码：

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//package com.nowjava;
/*来自 
 N o w J a v a . c o m*/

public class Main {

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

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

37.1234, 67.2344, 68.34534, 69.87700 };

double a = 2.45678;

System.out.println(java.util.Arrays.toString(add(w, a)));

}

/**

* Adds to an array w, a times v where a is a scalar.

* Since v can be smaller then w, we must specified the position at which v will be added.

* @param a scalar.

* @param p position.

public static double[] add(double[] w, double a, double[] v, int p) {

if (v.length > w.length) {

throw new IllegalArgumentException(

"Second array must be shorter or equal to the first one : "

+ w.length + ", " + v.length);

}

double[] ans = copy(w);/*来自 NowJava.com - 时代Java*/

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

ans[k] += a * v[k - p];

}

return (ans);

}

/**

* Adds a scalar to every element in the array.

public static double[] add(double[] w, double a) {

double[] ans = copy(w);

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

ans[k] += a;

}

return (ans);

}

/**

* Adds the two arrays together (componentwise).

* @throws IllegalArgumentException if the

*                                  two arrays don't have the same length.

public static double[] add(double[] a, double[] b) {

if (a.length != b.length) {

throw new IllegalArgumentException(

"To add two arrays, they must have the same length : "

+ a.length + ", " + b.length);

}

double[] ans = copy(a);

for (int i = 0; i < a.length; i++) {

ans[i] += b[i];

}

return (ans);

}

/**

* Adds to an array w, a times v where a is a scalar.

* Since v can be smaller then w, we must specified the position at which v will be added.

* @param a scalar.

* @param p position.

* @param w longer array.

* @param v shorter array.

* @throws IllegalArgumentException if the second array

*                                  is not shorter than the first one.

public static int[] add(int[] w, double a, int[] v, int p) {

if (v.length > w.length) {

throw new IllegalArgumentException(

"Second array must be shorter or equal to the first one : "

+ w.length + ", " + v.length);

}

int[] ans = copy(w);

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

ans[k] += a * v[k - p];

}

return (ans);

}

/**

* Adds a scalar to every element in the array.

public static int[] add(int[] w, int a) {

int[] ans = copy(w);

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

ans[k] += a;

}

return (ans);

}

/**

* Adds the two arrays together (componentwise).

* @throws IllegalArgumentException if the

*                                  two arrays don't have the same length.

public static int[] add(int[] a, int[] b) {

if (a.length != b.length) {

throw new IllegalArgumentException(

"To add two arrays, they must have the same length : "

+ a.length + ", " + b.length);

}

int[] ans = copy(a);

for (int i = 0; i < a.length; i++) {

ans[i] += b[i];

}

return (ans);

}

/**

* 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;

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();

}

/**

* Returns a copy of the array.

//a call to array.clone() may also work although this is a primitive type. I haven't checked

//it even may be faster

public static int[] copy(int[] array) {

int[] result;

result = new int[array.length];

System.arraycopy(array, 0, result, 0, array.length);

return result;

}

/**

* Returns a copy of the array.

//a call to array.clone() may also work although this is a primitive type. I haven't checked

//it even may be faster

public static long[] copy(long[] array) {

long[] result;

result = new long[array.length];

System.arraycopy(array, 0, result, 0, array.length);

return result;

}

/**

* Returns a copy of the array.

//a call to array.clone() may also work although this is a primitive type. I haven't checked
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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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