[mlevental]

lol don't blame the tools for your ignorance of them

    from scipy.sparse import eye, kron
    from scipy.spare import vstack as vs

    z = vs([
            kron(eye(y.shape[0]), x),
            kron(y, eye(x.shape[1]))
          ])

[enriquto]

It's exactly the same thing that I wrote, isn't it?

The thing that kills my soul is the need for the "vs" function. Why aren't the symbols [] not enough ?

[mlevental]

Because python is a different language from Matlab and python lists are lists and note 1d arrays?