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856天前import java.util.Scanner; |
import java.util.Arrays; |
public class Main { |
public static void main(String[] args) { |
Scanner scan = new Scanner(System.in); |
|
int r = scan.nextInt(); |
int c = scan.nextInt(); |
System.out.println("row:"+r+" column:"+c); |
//输入，修改矩阵的值 |
Matrix me = new Matrix(r,c); |
for(int i = 0; i < r; i++) |
{ |
for(int j = 0; j < c; j++) |
{ |
double a = scan.nextDouble(); |
me.set(i, j, a); |
} |
} |
r = scan.nextInt(); |
c = scan.nextInt(); |
double a = scan.nextDouble(); |
me.set(--r, --c, a); |
System.out.println("after set value:"); |
me.show(); |
//打印具体位置上的值 |
r = scan.nextInt(); |
c = scan.nextInt(); |
System.out.print("value on ("+r+","+c+"):"); |
System.out.printf("%.0f\n",me.get(--r, --c)); |
//矩阵相加输出 |
r = scan.nextInt(); |
c = scan.nextInt(); |
Matrix jia = new Matrix(r,c); |
for(int i = 0; i < r; i++) |
{ |
for(int j = 0; j < c; j++) |
{ |
a = scan.nextDouble(); |
jia.set(i, j, a); |
} |
} |
System.out.println("after add:"); |
(me.add(jia)).show(); |
//矩阵相乘输出 |
r = scan.nextInt(); |
c = scan.nextInt(); |
Matrix cheng = new Matrix(r,c); |
for(int i = 0; i < r; i++) |
{ |
for(int j = 0; j < c; j++) |
{ |
a = scan.nextDouble(); |
cheng.set(i, j, a); |
} |
} |
System.out.println("after multiply:"); |
(me.multiply(cheng)).show(); |
//矩阵转置输出 |
System.out.println("after transpose:"); |
(me.transpose()).show(); |
|
} |
} |
class Matrix |
{ |
private int row;//行 |
private int col;//列 |
double[][] m; |
public Matrix(int a, int b) |
{ |
row = a; |
col = b; |
m = new double [a][b]; |
} |
void set(int r, int c, double a) |
{ |
m[r][c] = a; |
} |
double get(int r, int c) |
{ |
return m[r][c]; |
} |
int width() |
{ |
return col; |
} |
int height() |
{ |
return row; |
} |
Matrix add(Matrix b) |
{ |
Matrix a = new Matrix(row,col); |
for(int i = 0; i < row; i++) |
{ |
for(int j = 0; j < col; j++) |
a.set(i,j, b.get(i,j)+this.m[i][j]); |
} |
return a; |
} |
Matrix multiply(Matrix b) |
{ |
Matrix a = new Matrix(row,b.width()); |
for( int i = 0; i < row; i++) |
{ |
for( int j = 0; j < b.width(); j++) |
{ |
int sum = 0; |
for( int k = 0; k < col; k++) |
sum += this.get(i,k)*b.get(k, j); |
a.set(i, j, sum); |
} |
} |
return a; |
} |
Matrix transpose() |
{ |
Matrix a = new Matrix(col,row); |
for(int i = 0; i < col; i++) |
{ |
for(int j = 0; j < row; j++) |
a.set(i,j,this.m[j][i]); |
} |
return a; |
} |
void show() |
{ |
for(int i = 0; i < row; i++) |
{ |
for(int j = 0; j < col; j++) |
{ |
if( j == 0) |
System.out.printf("%.0f",this.get(i, j)); |
else |
System.out.printf(" %.0f",this.get(i, j)); |
} |
System.out.println(); |
} |
} |
} |
