8000 numpy.linalg.qr crashes with empty arrays (Trac #1244) · Issue #1842 · numpy/numpy · GitHub
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numpy.linalg.qr crashes with empty arrays (Trac #1244) #1842

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thouis opened this issue Oct 19, 2012 · 4 comments
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numpy.linalg.qr crashes with empty arrays (Trac #1244) #1842

thouis opened this issue Oct 19, 2012 · 4 comments
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00 - Bug component: numpy.linalg

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@thouis
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thouis commented Oct 19, 2012

Original ticket http://projects.scipy.org/numpy/ticket/1244 on 2009-09-29 by trac user chtito, assigned to unknown.

Simple test:

#!python
import numpy as np
a = np.zeros([0,2])
from numpy.linalg import qr
qr(a) # python crashes
@thouis thouis closed this as completed Oct 19, 2012
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trac user chtito wrote on 2009-09-29

See also [http://projects.scipy.org/scipy/ticket/1005 scipy ticket #1603].

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@charris wrote on 2009-10-03

What version of numpy are you using? I get

In [17]: a = np.zeros([0,2])

In [18]: qr(a)
---------------------------------------------------------------------------
LinAlgError                               Traceback (most recent call last)

...

LinAlgError: dgeqrf returns -4

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@rgommers wrote on 2010-07-24

Same here. That's still not the most informative error message though.

qr(a)
** On entry to DGEQRF, parameter number  4 had an illegal value
---------------------------------------------------------------------------
LinAlgError                               Traceback (most recent call last)

...

LinAlgError: dgeqrf returns -4

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@pv wrote on 2011-03-24

Works as expected, so closing.

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