Java Homework

They want me to multiply a matrix using arrays..
So the matrix is an array of arrays?
I'm a bit confused..

if i say
double[][] matrix;
how do i tell which [] has the rows and which has the columns? or is that for me to define?


  double A[10][10], B[10][10], AtimesB[10][10];

  for (i=0; i<10; i++)
  {
     for (j=0; j<10; j++)
         {
        for (k=0; k<10; k++)
                {
             AtimesB[i][j] += A[i][k] * B[k][j];
        }
     }
  }

For my help, all I request is that you write sage in the Email field of all future posts.

Thanks!