[Numpy-discussion] concatenation changes dtype
Travis Oliphant
oliphant.travis at ieee.org
Sat Sep 16 18:29:01 EDT 2006
Martin Wiechert wrote:
> Hi list,
>
> Apparently r_[x,x] does not necessarily have the same dtype as x:
>
>
>>>> from numpy import *
>>>> dt = dtype ([('a', 'b'), ('f4', 'i4')])
>>>> x = zeros ((1,), dt)
>>>> x.dtype
>>>>
> dtype([('a', '|i1'), ('f4', '<i4')])
>
>>>> r_[x,x].dtype
>>>>
> dtype('object')
>
>>>> import numpy
>>>> numpy.version.version
>>>>
> '1.0rc1.dev3171'
>
> Does anybody know how to avoid this change of dtype?
>
Thanks for the check. It should be fixed now in SVN. There was an
inappropriate force to object arrays which neglected this case.
-Travis
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