[Numpy-discussion] concatenation changes dtype

Martin Wiechert martin.wiechert at gmx.de
Sat Sep 16 19:15:23 CDT 2006


On Sunday 17 September 2006 00:36, Travis Oliphant wrote:
> 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')])
>
> Did you mean to make a data-type that was a 1-byte integer followed by a
> 4-byte integer with field names of 'a' and 'f4'?
>
> Perhaps you meant:
>
> dtype([('a','f4'),('b','i4')])
>
> which is a 4-byte float followed by a 4-byte integer.
>

Thanks for the hint.
Actually, the code I posted was just for the sake of example. Still you 
correctly read my thoughts.

Martin.

>
> -Travis
>
>
>
>
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