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987天前import java.util.*; |
public class Main{ |
public static void main(String[] args) { |
Scanner scan = new Scanner(System.in); |
int row, col, i, j; |
double val; |
row = scan.nextInt(); |
col = scan.nextInt(); |
double [][] m = new double[row][col]; |
for(i = 0; i < row; i++) { |
for(j = 0; j < col; j++) { |
val = scan.nextDouble(); |
m[i][j] = val; |
} |
} |
System.out.println("row:" +row +" column:" +col); |
Matrix ma = new Matrix(row, col, m); |
|
row = scan.nextInt(); |
col = scan.nextInt(); |
val = scan.nextDouble(); |
ma.set(row, col, val); |
System.out.println("after set value:"); |
ma.print(); |
|
row = scan.nextInt(); |
col = scan.nextInt(); |
System.out.print("value on (" +row +"," +col +"):"); |
System.out.printf("%.0f", ma.get(row, col)); |
System.out.println(); |
|
row = scan.nextInt(); |
col = scan.nextInt(); |
double [][] m1 = new double[row][col]; |
for(i = 0; i < row; i++) { |
for(j = 0; j < col; j++) { |
val = scan.nextDouble(); |
m1[i][j] = val; |
} |
} |
Matrix ma1 = new Matrix(row, col, m1); |
System.out.println("after add:"); |
ma.add(ma1).print(); |
|
row = scan.nextInt(); |
col = scan.nextInt(); |
double [][] m2 = new double[row][col]; |
for(i = 0; i < row; i++) { |
for(j = 0; j < col; j++) { |
val = scan.nextDouble(); |
m2[i][j] = val; |
} |
} |
Matrix ma2 = new Matrix(row, col, m2); |
System.out.println("after multiply:"); |
ma.multiply(ma2).print(); |
|
System.out.println("after transpose:"); |
ma.transpose().print(); |
|
scan.close(); |
} |
} |
class Matrix{ |
int row; |
int col; |
int i, j; |
double [][] ma; |
public Matrix(int r, int c, double [][]m) { |
row = r; |
col = c; |
ma = new double[row][col]; |
ma = m; |
} |
public void set(int r, int c, double val) { |
ma[r-1][c-1] = val; |
} |
public double get(int r, int c) { |
return ma[r-1][c-1]; |
} |
public int width() { |
return col; |
} |
public int height() { |
return row; |
} |
public Matrix add(Matrix b) { |
Matrix t = new Matrix(b.row, b.col, b.ma); |
for(i = 0; i < row; i++) { |
for(j = 0; j < col; j++) |
t.ma[i][j] = this.ma[i][j] + b.ma[i][j]; |
} |
return t; |
} |
public Matrix multiply(Matrix b) { |
double [][] a= new double[row][b.col]; |
for(i = 0; i < row; i++) { |
for(j = 0; j < b.col; j++) { |
double sum = 0; |
int k; |
for(k = 0; k < row; k++) { |
sum += this.ma[i][k]*b.ma[k][j]; |
} |
a[i][j] = sum; |
} |
} |
Matrix t = new Matrix(row, b.col, a); |
return t; |
|
} |
public Matrix transpose(){ |
double [][] a = new double[col][row]; |
for(i = 0; i < col; i++) { |
for(j = 0; j < row; j++) { |
a[i][j] = this.ma[j][i]; |
} |
} |
Matrix t = new Matrix(col, row, a); |
return t; |
} |
public void print(){ |
for(i = 0; i < row; i++) { |
for(j = 0; j <col; j++) { |
if(j == 0) |
System.out.printf("%.0f", ma[i][j]); |
else |
System.out.printf(" %.0f", ma[i][j]); |
} |
System.out.println(); |
} |
} |
} |
