00:01
So we know with matrix multiplication that the number of columns in our first matrix must be equal to the number of rows in our second matrix.
00:10
So the easiest way to explain this is to give two matrices.
00:17
So we'll just do a two by two matrix and we'll say we're multiplying it by another.
00:25
Or let's do a matrix with one column, with two rows.
00:37
So we should still be able to multiply these matrices because we have the same number of rows and b as we do columns in a.
00:49
So just to run through what that would look like again, we would multiply this, the first row times this column and b, our only column.
00:59
And then that'll give us our first position in our resulting matrix, then we do the next row, same column in b, that'll give us the next one.
01:10
So that worked...