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Abstract definition of matrix multiplication

In the following tables, matrix http://wiki.apache.org/hama-data/attachments/MatrixMultiply/attachments/matrix_a.gif represents the quantities of the materials P and Q to produce products M and N. Matrix http://wiki.apache.org/hama-data/attachments/MatrixMultiply/attachments/matrix_b.gif represents the prices of the materials P and Q of the suppliers C1 and C2.

In this case, the first row of the second column of AB, aq + bs, represents the total cost of the producing product A.

       }}} P {{{       

       }}} Q {{{       

       }}} M {{{          

       }}} a {{{       

       }}} b {{{       

       }}} N {{{          

       }}} c {{{       

       }}} d {{{       

       }}} C1 {{{      

       }}} C2 {{{      

       }}} P {{{       

       }}} p {{{       

       }}} q {{{       

       }}} Q {{{       

       }}} r {{{       

       }}} s {{{       

• See how to multiply matrices using Map/Reduce