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java矩阵计算器代码 java编程输入求矩阵的乘积

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Java编写一个程序实现矩阵的运算加减乘除，（并对其中的异常进行处理）/**
* 矩阵：由 m × n 个数Aij排成的m行n列的数表称为m行n列的矩阵，简称m × n矩阵
* 说白了就是一个二维数组，下面的程序用整形作为数据类型，其他类型运算大同小异
*
*/
public class MatrixUtils {
/**
* 矩阵运算：加(减法与之类似)
*/
public static int[][] matrixAdd(int[][] addend, int[][] summand) {
if (addend == null || addend.length == 0) {
throw new IllegalArgumentException("addend matrix is empty!");
}
if (summand == null || summand.length == 0) {
throw new IllegalArgumentException("summand matrix is empty!");
}
//矩阵加减要求两个矩阵类型一致，即行列数相同
int row = addend.length;
int col = addend[0].length;
if (row != summand.length || col != summand[0].length) {
throw new IllegalArgumentException("summand and summand not the same type!");
}
int[][] sum = new int[row][col];
for (int i = 0; irow; i++) {
for (int j = 0; jcol; j++) {
sum[i][j] = addend[i][j] + summand[i][j];
// sum[i][j] = addend[i][j] - summand[i][j]; //减法
}
}
return sum;
}
/**
* 矩阵运算：乘法,没找到除法的运算规则
*/
public static int[][] matrixMultiply(int[][] addend, int[][] summand) {
if (addend == null || addend.length == 0) {
throw new IllegalArgumentException("addend matrix is empty!");
}
if (summand == null || summand.length == 0) {
throw new IllegalArgumentException("summand matrix is empty!");
}
//两个矩阵的乘法仅当第一个矩阵A的列数和另一个矩阵B的行数相等时才能定义 。如A是m×n矩阵和B是n×p矩阵，它们的乘积C是一个m×p矩阵
int row = addend.length;
int col = summand[0].length;
if (addend[0].length != summand.length) {
throw new IllegalArgumentException("summand and summand not the same type!");
}
int[][] sum = new int[row][col];
for (int i = 0; irow; i++) {
for (int j = 0; jcol; j++) {
for (int z = 0; zaddend[0].length; z++) {
sum[i][j] += addend[i][z] * summand[z][j];
System.out.println("sum[" + i+"]["+ j+"]= " + sum[i][j]);
}
}
}
return sum;
}
}
用java怎么写矩阵乘法？import java.util.Scanner;
public class Matrix {
public double[][] create() {
Scanner sc = new Scanner(System.in) ;
System.out.print（＂请输入矩阵的行高：＂）；
int a = sc.nextInt() ;
System.out.print（＂请输入矩阵的列宽：＂）；
int b = sc.nextInt() ;
double[][] x = new double[a][b] ;
for(int i=0;ilt;a;i++){
for(int j=0;jlt;b;j++){
System.out.print（＂请输入元素x[＂+i+＂][＂+j+＂]的值：＂ ）；
x[i][j] = sc.nextDouble() ;
}
}
return x ;
}
public double[][] multiply(double[][] x,double[][] y){
double[][] result = null ;
int a = x[0].length ;
int b = y.length ;
if(a != b){
System.out.println（＂输入的维数不匹配，不能进行运算＂）；
}else{
int c = x.length ;
int d = y[0].length ;
result = new double[c][d] ;
for(int i=0;ilt;c;i++){
for(int j=0;jlt;d;j++){
【java矩阵计算器代码 java编程输入求矩阵的乘积】double sum = 0 ;
for(int k=0;klt;a;k++){
sum += x[i][k]*y[k][j] ;
}
result[i][j] = sum ;
}
}
}
return result ;
}
public void print(double[][] x){
System.out.println（＂矩阵为：＂）；
for(int i=0;ilt;x.length;i++){
for(int j=0;jlt;x[i].length;j++){
System.out.print(x[i][j] + ＂ ＂) ;
}
System.out.println();

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