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Bug in rec.fromarrays in handling length-0 strings (Trac #1303), now with segfault. #1901
Description
Original ticket http://projects.scipy.org/numpy/ticket/1303 on 2009-11-25 by trac user dyamins, assigned to unknown.
I'm using 1.4.0.dev7746, on Mac OSX 10.5.8. The problems below occur both for python 2.5 compiled 32-bit as well as python2.6 compiled 64-bit.
A problem arises when you try to create a record array passing a type of '|S0'.
>>> Cols = [ [ 'test' ]*10 , [ '' ]*10]
When not passing any dtype, this is created into a recarray with no problem:
>>> np.rec.fromarrays(Cols)
rec.array([('test', _), ('test', _), ('test', _), ('test', _),
('test', _), ('test', _), ('test', _), ('test', _),
('test', _), ('test', _)],
dtype=[('f0', '|S4'), ('f1', '|S1')])
However, trouble arises when I try to pass a length-0 dtype explicitly.
>>> d = np.dtype([('A', '|S4'), ('B', '|S')])
>>> np.rec.fromarrays(Cols,dtype=d)
rec.array([('test', _), ('\x00est', _), ('\x00est', _), ('\x00est', _),
('\x00est', _), ('\x00est', _), ('\x00est', _), ('\x00est', _),
('\x00est', _), ('\x00est', _)],
dtype=[('A', '|S4'), ('B', '|S0')])
The same thing occurs if I cast to np arrays before passing to np.rec.fromarrays:
>>> _arrays = [np.array(Cols[0],'|S4'),np.array(Cols[1],'|S')]
[array(['test', 'test', 'test', 'test', 'test', 'test', 'test', 'test',
'test', 'test'],
dtype='|S4'),
array([_, _, _, _, _, _, _, _, _, _],
dtype='|S1')]
>>> np.rec.fromarrays(_arrays,dtype=d)
rec.array([('test', _), ('\x00est', _), ('\x00est', _), ('\x00est', _),
('\x00est', _), ('\x00est', _), ('\x00est', _), ('\x00est', _),
('\x00est', _), ('\x00est', _)],
dtype=[('A', '|S4'), ('B', '|S0')])
Activity
thouis commentedon Oct 19, 2012
Milestone changed to
Unscheduledby @mwiebe on 2011-03-25charris commentedon Feb 21, 2014
In 1.9-devel it segfaults. May be related to #2585.
BUG: Fix numerous bugs related to zero-width string arrays (numpy#473, …
ahaldane commentedon Jun 2, 2016
Fixed by #6430