Another Way to Visualize

Your computer graphics book might show a different way to do matrix-matrix multiplication. There are several ways to think about it, although the results are the same. The diagram shows another way to visualize the product AB = C.

Write A to the left and B above the result, C. Now draw horizontal lines and vertical lines to divide C into cells. This will automatically form the correct number of cells.

The number to put in each cell is the dot product of the row of A and column of B that intersect to for the cell.