append field to record array?

Question

If I define a structured array:

import numpy as np
x = np.array([(1, 'O', 1)],
             dtype=np.dtype([('step', 'int32'),
                             ('symbol', '|S1'),
                             ('index', 'int32')]))

seems fine until I do this:

import numpy.lib.recfunctions as rec
rec.append_fields(x,'x',x['index']+1)

gives me

TypeError: object of type 'numpy.int32' has no len()

presumably because x.shape is (1,) rather than (1,3). How do I append columns to this structured array?

Your code works for me. What version of Python/NumPy are you using? — Sven Marnach
– Sven Marnach, Commented Oct 12, 2011 at 12:54
This is a bug in older versions of numpy (such as 1.3.0). It seems to only affect structure arrays of shape (1,). — unutbu
– unutbu, Commented Oct 12, 2011 at 13:27

hatmatrix · Accepted Answer · 2011-10-12 15:13:57Z

1

Thanks all. On NumPy 1.4.1 this was giving me the error but I just upgraded to the git 2.0 version and it works fine.

answered Oct 12, 2011 at 15:13

hatmatrix

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