[Numpy-discussion] Reversing RecArrays
Todd Miller
jmiller at stsci.edu
Wed Mar 9 13:55:09 EST 2005
On Wed, 2005-03-09 at 13:46, Francesc Altet wrote:
> Hi,
>
> I would be interested in having a fast way to reverse RecArrays.
> Regrettably, the most straightforward way to reverse them does not
> work properly:
>
> >>> from numarray import records
> >>> r = records.array([('Smith', 1234),\
> ... ('Johnson', 1001),\
> ... ('Williams', 1357),\
> ... ('Miller', 2468)], \
> ... names='Last_name, phone_number')
> >>> r[::-1]
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "/usr/lib/python2.3/site-packages/numarray/records.py", line 749, in
> __repr__
> outlist.append(Record.__str__(i))
> File "/usr/lib/python2.3/site-packages/numarray/records.py", line 797, in
> __str__
> outlist.append(`self.array.field(i)[self.row]`)
> File "/usr/lib/python2.3/site-packages/numarray/records.py", line 736, in
> field
> self._fields = self._get_fields() # Refresh the cache
> File "/usr/lib/python2.3/site-packages/numarray/records.py", line 705, in
> _get_fields
> bytestride=_stride)
> File "/usr/lib/python2.3/site-packages/numarray/strings.py", line 112, in
> __init__
> raise ValueError("Inconsistent string and array parameters.")
> ValueError: Inconsistent string and array parameters.
>
> Anyway, anybody knows if there is some way to achieve this (until this
> bug would be eventually fixed, of course)?
This now works in CVS. The attached reverse() also works against CVS
and should work against 1.2.2.
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