tg-me.com/java_codings/76
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56. Matrix Operations.
import java.util.Scanner;
public class Matrices {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter number of rows: ");
int rows = scanner.nextInt();
System.out.print("Enter number of columns: ");
int columns = scanner.nextInt();
System.out.println();
System.out.println("Enter first matrix");
int[][] a = readMatrix(rows, columns);
System.out.println();
System.out.println("Enter second matrix");
int[][] b = readMatrix(rows, columns);
int[][] sum = add(a, b);
int[][] difference1 = subtract(a, b);
int[][] difference2 = subtract(b, a);
System.out.println();
System.out.println("A + B =");
printMatrix(sum);
System.out.println();
System.out.println("A - B =");
printMatrix(difference1);
System.out.println();
System.out.println("B - A =");
printMatrix(difference2);
}
public static int[][] readMatrix(int rows, int columns) {
int[][] result = new int[rows][columns];
Scanner s = new Scanner(System.in);
for (int i = 0; i < rows; i++) {
for (int j = 0; j < columns; j++) {
result[i][j] = s.nextInt();
}
}
return result;
}
public static int[][] add(int[][] a, int[][] b) {
int rows = a.length;
int columns = a[0].length;
int[][] result = new int[rows][columns];
for (int i = 0; i < rows; i++) {
for (int j = 0; j < columns; j++) {
result[i][j] = a[i][j] + b[i][j];
}
}
return result;
}
public static int[][] subtract(int[][] a, int[][] b) {
int rows = a.length;
int columns = a[0].length;
int[][] result = new int[rows][columns];
for (int i = 0; i < rows; i++) {
for (int j = 0; j < columns; j++) {
result[i][j] = a[i][j] - b[i][j];
}
}
return result;
}
public static void printMatrix(int[][] matrix) {
int rows = matrix.length;
int columns = matrix[0].length;
for (int i = 0; i < rows; i++) {
for (int j = 0; j < columns; j++) {
System.out.print(matrix[i][j] + " ");
}
System.out.println();
}
}
}
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