On Fri, Nov 18, 2011 at 08:45:59AM +1100, Robert Layton wrote:
>         D = np.abs(X[:, np.newaxis, :] - Y[np.newaxis, :, :])

>    * what does putting np.newaxis do here?

It adds an empty axis in the corresponding direction, so that
broadcasting can work.

This will never work on sparse matrices. If we want this function to work
on sparse matrix, we will need to write code that is specific to sparse
matrices.

G

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