Multiply multi-dimensional array with vector

[Mark_L_Stone]

Just for the record, because bsxfun is mentioned as an alternative to implicit expansion in the link a couple of posts back, bsxfun is not supported by CVX.

BSXFUN in CVX

Yes, bsxfun is a very useful function, but it has not been implemented for CVX objects. However, that does not mean you have to use a loop, and indeed you certainly never should. For instance, consider this: cvx_begin variable X(n,n) variable y(n) and suppose you want to subtract y from each column of X. Then you can do this: X - y(:,ones(1,n))

The example, which predates MATLAB introduction of implicit expansion, or the MATLAB term “implicit expansion”, is kind of a pre(non)implicit expansion way of doing implicit expansion.