Hello everyone,

I have to matrices I want to multiply element by element. The matrix A with dimensions 128x60 and the matrix B with dimensions is 7680x1 (as you might notice 7680=128x60). The thing is that when I do this in debug

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 A.array() * B.array()

An assert is raised saying the dimensions do not match.

Digging on the web and having a look to eigen API I have found two possible solutions.

• The first approach is to do some resizing. I can't resize A because is a constant member of a class and making such a thing will make my code not thread safe (it is being used as a matrix in other places). I can resize B but then I have to resize it back to its original size. This could be an option.
• The second solution is creating a Map with the size i like. This way I don't have to resize it back the matrix. So doing
  

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  Map<Matrix> mapA (A.data, A.rows()*A.cols(), 1)

  
  This is working and is the thing i am doing right now

So my question is, Is there a more elegant way to achieve this?

No better solution yet, but at some point we should offer a reshape and 'view as vector' feature.

Good to know.

Thanks Gael for you quick answer.