[Numpy-discussion] addressing a submatrix (original) (raw)
Karol Langner karol.langner at kn.pl
Wed Jun 14 05:50:33 EDT 2006
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On Wednesday 14 June 2006 11:14, Martin Wiechert wrote:
is there a concise way to address a subrectangle of a 2d array? So far I'm using
A [I] [:, J] which is not pretty and more importantly only works for reading the subrectangle. Writing does not work. (Cf. session below.) Any help would be appreciated. Thanks, Martin
You can also use A[m:n,r:s] to refernce a subarray.
For instance:
a = numpy.zeros((5,5)) b = numpy.ones((3,3)) a[1:4,1:4] = b a array([[0, 0, 0, 0, 0], [0, 1, 1, 1, 0], [0, 1, 1, 1, 0], [0, 1, 1, 1, 0], [0, 0, 0, 0, 0]])
Cheers, Karol
-- written by Karol Langner śro cze 14 11:49:35 CEST 2006
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