[Numpy-discussion] how to efficiently select multiple slices from an array?
Andreas Hilboll
lists@hilboll...
Wed Mar 20 10:31:04 CDT 2013
Cross-posting a question I asked on SO
(http://stackoverflow.com/q/15527666/152439):
Given an array
d = np.random.randn(100)
and an index array
i = np.random.random_integers(low=3, high=d.size - 5, size=20)
how can I efficiently create a 2d array r with
r.shape = (20, 8)
such that for all j=0..19,
r[j] = d[i[j]-3:i[j]+5]
In my case, the arrays are quite large (~200000 instead of 100 and 20),
so something quick would be useful.
Cheers, Andreas.
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