ke, 2009-11-25 kello 09:48 -0500, Dan Yamins kirjoitti:
> Hi, I'm writing to report what looks like a two bugs in the handling
> of strings of length 0. (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).
[clip]
> >>> 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)
> recarray([('test', ''), ('\x00est', ''), ('\x00est', ''), ('\x00est',
> ''),
> ('\x00est', ''), ('\x00est', ''), ('\x00est', ''), ('\x00est',
> ''),
> ('\x00est', ''), ('\x00est', '')],
> dtype=[('A', '|S4'), ('B', '|S0')])
That certainly looks like a bug -- where does the \0 appear in front of
all but the first string?
File a ticket in Trac, http://projects.scipy.org/numpy/ -- small bugs
like this tend to get lost and forgotten in mailing list traffic.
--
Pauli Virtanen
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