Multiplying two matrices in Java

Question

Below is the method which I want it to return the product matrix. 

   public Matrix multiply(Matrix A) {

            ////code

   }

Since it’s multiplication on the right, I think I should do A.multiply(B) to return matrix AB, with B on the right. Can anyone tell me an easy algorithm to achieve this? 

Answer 1

If speed is not a concern for you, you can do the below O(n^3) implementation:

  for (int i=0; i<l; ++i)

    for (int j=0; j<n; ++j)

      for (int k=0; k<m; ++k)

        c[i][j] += a[i][k] * b[k][j]  

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