CVX - mtimes error - multiplication of vectors

Question

Sree Prasanna Rajagopal 2013-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/78842-cvx-mtimes-error-multiplication-of-vectors

Is there a way to do vector multiplication in the cvx ( http://cvxr.com/cvx/) environment? Because there is a problem I need to solve and I'm not sure how a constraint can be framed without something so simple as a vector multiplication. I was using fmincon and there was no problem but now, when I use the same function, I get errors.

The operation I get error on is like this:

C = A*B

where A = column vector and B = row vector

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Answer 1

Roger Stafford 2013-6-12

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If A is a column vector and B a row vector, you should get no error message on the operation

C = A*B

The result should be an array which has as many rows as elements in A and as many columns as elements in B. It contains every possible product between elements of A and B.

You WILL get an error if A is a row vector and B a column vector if they have different numbers of elements.

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Sree Prasanna Rajagopal 2013-6-12

Yeah, I'm not talking about general matrix multiplication rules here. My question is specific to the CVX environment.

Roger Stafford 2013-6-12

You should not assume that people who answer questions here understand the workings of CVX. Certainly I don't. Please phrase your question in terms such that we can easily understand what you are asking without having to comprehend all the details of CVX.

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