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将double数组和整数array逐元素相乘。
/**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. */ public static long[][] multiplyElementwise(long[][] a,