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matrix multiplication with different dimension

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Berbia
Berbia 2013-1-26
I need to perform a matrix multiplication with different dimensions, let
A*B=C;
where the dimension of A is 700*5 and the dimension of C should be 1*5, what will be the dimension of B?? Is this possible??

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Walter Roberson
Walter Roberson 2013-1-26
No. However it would be possible if it were B*A = C instead, in which case B would have to be 1 x 700

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