[Numpy-discussion] Selecting columns of a matrix (original) (raw)

Alan G Isaac aisaac at american.edu
Wed Jun 21 22:08:50 EDT 2006

Alan G Isaac wrote:

M.transpose()[V>0] If you want the columns as columns, you can transpose again.

On Wed, 21 Jun 2006, Keith Goodman apparently wrote:

I can't get that to work when M is a n by m matrix:

The problem is not M being a matrix. You made V a matrix (i.e., 2d). So you need to ravel() it first.

M.transpose()[V.ravel()>0]

hth, Alan Isaac

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