Question

Language Java

Write a function named sumMatrices() that takes two matrices, say A and B, and returns a summation matrix C = A + B whose C[i][j] = A[i][j]+B[i][j].

Answer 1

Here is code:

private static int[][] sumMatrices(int[][] A, int[][] B) {
int[][] C = new int[A.length][A[0].length];
for (int i = 0; i < A.length; i++) {
for (int j = 0; j < A[i].length; j++) {
C[i][j] = A[i][j] + B[i][j];
}
}
return C;
}

Sample code to test:

public class Sum {

public static void main(String[] args) {
int matA[][] = {{1, 2, 3, 4},
{5, 6, 7, 8},
{9, 10, 11, 12}};

int matB[][] = {{12, 11, 10, 9},
{8, 7, 6, 5},
{4, 3, 2, 1}};

int[][] matC = sumMatrices(matA, matB);
for (int i = 0; i < matC.length; i++) {
for (int j = 0; j < matC[i].length; j++) {
System.out.print(matC[i][j] + " ");
}
System.out.println("");
}
}

private static int[][] sumMatrices(int[][] A, int[][] B) {
int[][] C = new int[A.length][A[0].length];
for (int i = 0; i < A.length; i++) {
for (int j = 0; j < A[i].length; j++) {
C[i][j] = A[i][j] + B[i][j];
}
}
return C;
}
}

Output:

13 13 13 13 13 13 13 13 13 13 13 13