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Java 将一个双精度数组和一个整数数组元素相乘

欢马劈雪

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将double数组和整数array逐元素相乘。

实例源码：

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/**来自 n o w j a v a . c o m - 时代Java**/

//package com.nowjava;

public class Main {

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

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

37.1234, 67.2344, 68.34534, 69.87700 };

int[] b = new int[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };

System.out.println(java.util.Arrays.toString(multiplyElementwise(a,

b)));

}

/**

* Multiplies an array of doubles and an array of integers element-wise.

* @param a   Array of doubles.

* @param b   Array of integers.

* @return   Element-wise product of the arrays.

* @throws ArithmeticException   Throws an exception when the two vectors are

* not of the same size.

*//*时 代 J a v a 公 众 号 提供*/

public static double[] multiplyElementwise(double[] a, int[] b)

throws ArithmeticException {

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

throw new ArithmeticException();

} else {

double[] result = new double[a.length];

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

result[i] = a[i] * b[i];

}

return result;

}

/**

* Multiplies two arrays of doubles element-wise.

* @param a   Array of doubles.

* @param b   Array of doubles.

* @return   Element-wise product of the two arrays.

* @throws ArithmeticException   Throws an exception when the two vectors are

* not of the same size.

public static double[] multiplyElementwise(double[] a, double[] b)

throws ArithmeticException {

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

throw new ArithmeticException();

} else {

double[] result = new double[a.length];

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

result[i] = a[i] * b[i];

}

return result;

}

/**

* Multiplies two arrays of integers element-wise.

* @param a   Array of integers.

* @param b   Array of integers.

* @return   Element-wise product of the two arrays.

* @throws ArithmeticException   Throws an exception when the two vectors are

* not of the same size.

public static int[] multiplyElementwise(int[] a, int[] b)

throws ArithmeticException {

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

throw new ArithmeticException();

} else {

int[] result = new int[a.length];

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

result[i] = a[i] * b[i];

}

return result;

}

/**

* Multiplies two arrays of floats element-wise.

* @param a   Array of floats.

* @param b   Array of floats.

* @return   Element-wise product of the two arrays.

* @throws ArithmeticException   Throws an exception when the two vectors are

* not of the same size.

public static float[] multiplyElementwise(float[] a, float[] b)

throws ArithmeticException {

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

throw new ArithmeticException();

} else {

float[] result = new float[a.length];

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

result[i] = a[i] * b[i];

}

return result;

}

/**

* Multiplies two arrays of longs element-wise.

* @param a   Array of longs.

* @param b   Array of longs.

* @return   Element-wise product of the two arrays.

* @throws ArithmeticException   Throws an exception when the two vectors are

* not of the same size.

public static long[] multiplyElementwise(long[] a, long[] b)

throws ArithmeticException {

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

throw new ArithmeticException();

} else {

long[] result = new long[a.length];

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

result[i] = a[i] * b[i];

}

return result;

}

/**

* Multiplies two arrays of bytes element-wise.

* @param a   Array of bytes.

* @param b   Array of bytes.

* @return   Element-wise product of the two arrays.

* @throws ArithmeticException   Throws an exception when the two vectors are

* not of the same size.

public static byte[] multiplyElementwise(byte[] a, byte[] b)

throws ArithmeticException {

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

throw new ArithmeticException();

} else {

byte[] result = new byte[a.length];

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

result[i] = (byte) (a[i] * b[i]);

}

return result;

}

/**

* Multiplies two matrices of doubles element-wise.

* @param a   Matrix of doubles.

* @param b   Matrix of doubles.

* @return   Element-wise product of the two matrices.

* @throws ArithmeticException   Throws an exception when the two matrices are

* not of the same size.

public static double[][] multiplyElementwise(double[][] a, double[][] b)

throws ArithmeticException {

if (a.length != b.length || a[0].length != b[0].length) {

throw new ArithmeticException();

} else {

double[][] result = new double[a.length][a[0].length];

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

for (int j = 0; j < a[0].length; j++) {

result[i][j] = a[i][j] * b[i][j];

}

return result;

}

/**

* Multiplies two matrices of integers element-wise.

* @param a   Matrix of integers.

* @param b   Matrix of integers.

* @return   Element-wise product of the two matrices.

* @throws ArithmeticException   Throws an exception when the two matrices are

* not of the same size.

public static int[][] multiplyElementwise(int[][] a, int[][] b)

throws ArithmeticException {

if (a.length != b.length || a[0].length != b[0].length) {

throw new ArithmeticException();

} else {

int[][] result = new int[a.length][a[0].length];

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

for (int j = 0; j < a[0].length; j++) {

result[i][j] = a[i][j] * b[i][j];

}

return result;

}

/**

* Multiplies two matrices of floats element-wise.

* @param a   Matrix of floats.

* @param b   Matrix of floats.

* @return   Element-wise product of the two matrices.

* @throws ArithmeticException   Throws an exception when the two matrices are

* not of the same size.

public static float[][] multiplyElementwise(float[][] a, float[][] b)

throws ArithmeticException {

if (a.length != b.length || a[0].length != b[0].length) {

throw new ArithmeticException();

} else {

float[][] result = new float[a.length][a[0].length];

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

for (int j = 0; j < a[0].length; j++) {

result[i][j] = a[i][j] * b[i][j];

}

return result;

}

/**

* Multiplies two matrices of longs element-wise.

* @param a   Matrix of longs.

* @param b   Matrix of longs.

* @return   Element-wise product of the two matrices.

* @throws ArithmeticException   Throws an exception when the two matrices are

* not of the same size.

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

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