matrix

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lowcalorie
lowcalorie 2012-5-23
A is an m x n array and B is an r x s array. how do i write an expression to multiply A and B and place the result in array C

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Junaid
Junaid 2012-5-23
C = A * B;
Just make sure that dimensions of A and B are consistent to be multiplied as Suggested by Wayne King above.

更多回答（2 个）

Wayne King
Wayne King 2012-5-23
If n and r are not equal, you can't. Unless there are some details that you are not telling us.
Walter Roberson
Walter Roberson 2012-5-23
What size would you intend the result to be? Multiplication of matrices is defined if they are the same size, or if they are two dimensional (as yours are) and if the second dimension of one of them is the same as the first dimension of the other one (as yours are not)
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lowcalorie
lowcalorie 2012-5-23
the same size as A and B just defined as matrix C
Walter Roberson
Walter Roberson 2012-5-23
A and B are different sizes according to your "m x n and r x s". Are you looking for C to be m x s, or to be r x n, or to be m x n x r x s (4 dimensional), or to be m x n, or to be min(m,r) x min(n,s) or ... ?

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