[Numpy-discussion] Segfault on wrong use of indexing

Charles R Harris charlesr.harris@gmail....
Mon Sep 17 11:43:03 CDT 2007


Hi Arnar,

On 9/17/07, Arnar Flatberg <arnar.flatberg@gmail.com> wrote:
>
> Hi list
> A pretty common use (for me) is to create arrays at the beginning of
> my code and then fill in parts as I go along. Today, my code hit a
> segmentation fault. The error was that an index-vector ,that usually
> is a list with several members, now contained only one member and I
> tried to insert a 1-dim vector.
>
> Here is a short example of what went wrong:
>
> Python 2.5.1 (r251:54863, May  2 2007, 16:56:35)
> [GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import numpy as n
> >>> n.__version__
> '1.0.1'
> >>> a = n.random.rand(4,2)
> >>> a
> array([[ 0.79561255,  0.4932522 ],
>        [ 0.84008255,  0.88258233],
>        [ 0.35143166,  0.82214487],
>        [ 0.12490114,  0.15799074]])
>
> Let us insert [2,2] into the first row.
> Correct use:
> >>> a[0,:] = [2,2]
> >>> a
> array([[ 2.        ,  2.        ],
>        [ 0.84008255,  0.88258233],
>        [ 0.35143166,  0.82214487],
>        [ 0.12490114,  0.15799074]])
> or:
> a[[0],:] = [[2,2]]
>
> However, when I tried to to insert a 1-dim array with a 'two-dim'
> index things went wrong:
> >>> a[[0],:] = [2,2]
> Segmentation fault


I don't see that here. Can you try a more recent version of Numpy? 1.0.1 is
pretty old.

Chuck
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