[Numpy-discussion] indexing of rank-0 structured arrays: why not?
Nils Becker
n.becker at amolf.nl
Mon Jan 10 11:08:38 EST 2011
Hi,
I noticed that I can index into a dtype when I take an element
of a rank-1 array but not if I make a rank-0 array directly. This seems
inconsistent. A bug?
Nils
In [76]: np.version.version
Out[76]: '1.5.1'
In [78]: dt = np.dtype([('x', '<f8'), ('y', '<f8')])
In [80]: a_rank_1 = np.zeros((1,), dtype=dt)
In [81]: a_rank_0 = np.zeros((), dtype=dt)
In [83]: a_rank_1[0]
Out[83]: (0.0, 0.0)
In [84]: a_rank_1[0] == a_rank_0
Out[84]: True
In [85]: a_rank_1[0][0]
Out[85]: 0.0
In [86]: a_rank_0[0]
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
/home/pabra/ramp/testramp/<ipython console> in <module>()
IndexError: 0-d arrays can't be indexed
In [87]: a_rank_0['x']
Out[87]: array(0.0)
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