[Numpy-discussion] Re: linalg.svd returns fortran arrays, causes problems
Robert Kern
robert.kern at gmail.com
Mon Mar 20 17:26:07 CST 2006
Zachary Pincus wrote:
> numpy.reshape(numpy.array([[1,2,3,4,5,6,7,8,9,10],
> [11,12,13,14,15,16,17,18,19,20]], fortran = False), [2, 5, 2])
> array([[[ 1, 2],
> [ 3, 4],
> [ 5, 6],
> [ 7, 8],
> [ 9, 10]],
>
> [[11, 12],
> [13, 14],
> [15, 16],
> [17, 18],
> [19, 20]]])
>
> numpy.reshape(numpy.array([[1,2,3,4,5,6,7,8,9,10],
> [11,12,13,14,15,16,17,18,19,20]], fortran = True), [2, 5, 2])
> array([[[ 1, 6],
> [ 2, 7],
> [ 3, 8],
> [ 4, 9],
> [ 5, 10]],
>
> [[11, 16],
> [12, 17],
> [13, 18],
> [14, 19],
> [15, 20]]])
I think this is a new bug, then.
In [82]: reshape(numpy.array([[1,2,3,4,5,6,7,8,9,10],
[11,12,13,14,15,16,17,18,19,20]], fortran = True), (2,5,2))
Out[82]:
array([[[ 1, 2],
[ 3, 4],
[ 5, 6],
[ 7, 8],
[ 9, 10]],
[[11, 12],
[13, 14],
[15, 16],
[17, 18],
[19, 20]]])
In [83]: reshape(numpy.array([[1,2,3,4,5,6,7,8,9,10],
[11,12,13,14,15,16,17,18,19,20]], fortran = False), (2,5,2))
Out[83]:
array([[[ 1, 2],
[ 3, 4],
[ 5, 6],
[ 7, 8],
[ 9, 10]],
[[11, 12],
[13, 14],
[15, 16],
[17, 18],
[19, 20]]])
In [84]: numpy.__version__
Out[84]: '0.9.6.2148'
--
Robert Kern
robert.kern at gmail.com
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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