multiprod error

DB DB

2012 5 6

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I used the multiprod command to "multiple" two matrices:

A of size 1 x m x m x m

B of size m x 1 x k_1 x k_2 ... x k_m

In any case, I've used this command before without any problem. However, when I added an extra dimension to the matrix B it yields the following error:

Error using bsxfun Non-singleton dimensions of the two input arrays must match each other.

Any help would be much appreciated.

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DB DB 2012-5-6

Thanks for the response everyone. Yes - I am referring to the multiprod command from the File Exchange. The resulting dimensions should be an m x m x k_1 x...x k_m. Thanks

James Tursa 2012-5-6

Given the resulting dimension, I don't understand how the result is supposed to be formed. Suppose the result is C. Can you write an explicit expression for how you expect the m x m part of the result C to be formed? I.e., fill in the blanks for one of the m x m part results:

C(:,:,______) = A(_____) * B(______)

How do the initial 1 x m dimension of A and the initial m x 1 dimension of B figure into this?

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