1. Open your command window
2. Type your variable matrix, say x having 3 columns and 3 rows. Type the matrix as shown below.
3. Hit enter
4. Type the other matrix, say, y with which you want to multiply. Type the variable as shown.
5. Hit enter
6. Set the new variable, say, z which you want the matrix to come in.
7. Type the variable, z= x*y, and hit enter.