[Numpy-discussion] Indexing by label in 3rd dimension

Benjamin Root ben.root@ou....
Fri Sep 16 10:33:37 CDT 2011


On Friday, September 16, 2011, Benjamin Landenberger <
benjamin.landenberger@imtek.uni-freiburg.de> wrote:
> Hello list!
>
> I have an array *mask* of shape (a, b) and another array *intensities*
> of shape (N, a, b), where the values in *mask* range from 0 to N-1. It
> is somehow similar to label arrays in scipy.ndimage.
>
> Now I want to pick those entries from the first dimension of
> *intensities* which are given by *mask*. The returned array shall again
> wave shape (a, b).
>
> Can this be done with fancy indexing?
>
> Thank you,
>
> Ben
>

Try intensities[mask, xrange(a), xrange(b)].

Untested, but it would work for 1d, haven't tried for 2d.

Ben Root
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.scipy.org/pipermail/numpy-discussion/attachments/20110916/e657e820/attachment.html 


More information about the NumPy-Discussion mailing list