Re: [Numpy-discussion] Conversion of heterogeneous arrays in numpy<-->numarray

[Perry G. <pe...@st...>]

I think it would be a good thing, but right now we are more focused on =20=

seeing what is involved in porting some of our libraries first. I'll =20
try to find out how much work it would be though.

Perry

On Jan 10, 2006, at 1:58 PM, Francesc Altet wrote:

> Hi,
>
> Is there any plan to provide a conversion between recarrays in numpy
> and numarray?. For the moment it does not seem to work:
>
> In [83]: r=3Dnumarray.records.array([(1,11,'a'),(2,22,'b')], =20
> formats=3D'u1,f4,a1')
>
> In [84]: a=3Dnumpy.array(r, dtype=3D'u1,f4,a1')
>
> In [85]: numarray.records.array(a)
> =
-----------------------------------------------------------------------=20=

> ----
> exceptions.ValueError                                Traceback (most =20=

> recent
> call last)
>
> /tmp/<console>
>
> /usr/lib/python2.3/site-packages/numarray-1.5.0-py2.3-linux-i686.egg/=20=

> numarray/records.py
> in array(buffer, formats, shape, names, byteorder, aligned)
>     406                     byteorder=3Dbyteorder, aligned=3Daligned)
>     407     else:
> --> 408         raise ValueError("Unknown input type")
>     409
>     410 def _RecGetType(name):
>
> ValueError: Unknown input type
>
> In [86]: numpy.array(r)
> Out[86]: array([0Aa, =B0Ab], dtype=3D(void,6))
>
> However, if one specifies the format in for the numarray-->numpy it
> does seem to work:
>
> In [87]: numpy.array(r, dtype=3D'u1,f4,a1')
> Out[87]: array([(1, 11.0, 'a'), (2, 22.0, 'b')], dtype=3D(void,6))
>
> But not in the sense numpy-->numarray:
>
> In [88]: numarray.records.array(a, formats=3D'u1,f4,a1')
> =
-----------------------------------------------------------------------=20=

> ----
> exceptions.ValueError                                Traceback (most =20=

> recent
> call last)
>
> /tmp/<console>
>
> /usr/lib/python2.3/site-packages/numarray-1.5.0-py2.3-linux-i686.egg/=20=

> numarray/records.py
> in array(buffer, formats, shape, names, byteorder, aligned)
>     406                     byteorder=3Dbyteorder, aligned=3Daligned)
>     407     else:
> --> 408         raise ValueError("Unknown input type")
>     409
>     410 def _RecGetType(name):
>
> ValueError: Unknown input type
>
> Having this would be great for supporting heterogeneous arrays in
> PyTables.
>
> Regards,
>
> --=20
>> 0,0<   Francesc Altet =A0 =A0 http://www.carabos.com/
> V   V   C=E1rabos Coop. V. =A0=A0Enjoy Data
>  "-"
>
>
>
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