MatrixMultiplication.md (523B)
1 # Matrix Multiplication 2 3 Khan U2 4 5 **Definition:** The product of A and B is defined as AB where each column of AB is Axb_n where n is the number of the column. 6 7 Idea: 8 9 AB = [Ab_1 Ab_2 ... Ab_n] 10 11 Note: To multiply two matricies the number of columns in the first matrix must be equal to the number of rows in the second matrix. 12 13 AB is not equal to BA (in pretty much all cases). Often this is not even defined. 14 15 See [VectorMatrixMultipication](VectorMatrixMultipication.md) for information about vector and matrix products.