[Numpy-discussion] Some inconsistency in numarray.records format support

[Francesc A. <fa...@ca...>]

Hi,

When building recarrays in numpy following the numarray convention:

In [2]: numpy.zeros((3,), dtype=3D'u1')
Out[2]: array([0, 0, 0], dtype=3Duint8)

In [3]: numpy.zeros((3,), dtype=3D'u1,f4')
Out[3]: array([(0, 0.0), (0, 0.0), (0, 0.0)], dtype=3D(void,5))

In [4]: numpy.zeros((3,), dtype=3D'2u1,f4')
Out[4]:
array([(array([0, 0], dtype=3Duint8), 0.0),
       (array([0, 0], dtype=3Duint8), 0.0), (array([0, 0], dtype=3Duint8), =
0.0)],=20
dtype=3D(void,6))

In [7]: numpy.zeros((3,), dtype=3D'(2,)u1,f4')
Out[7]:
array([(array([0, 0], dtype=3Duint8), 0.0),
       (array([0, 0], dtype=3Duint8), 0.0), (array([0, 0], dtype=3Duint8), =
0.0)],=20
dtype=3D(void,6))


So far so good, but


In [5]: numpy.zeros((3,), dtype=3D'2u1')
=2D------------------------------------------------------------------------=
=2D-
exceptions.TypeError                                 Traceback (most recent=
=20
call last)

/home/faltet/python.nobackup/numpy/<ipython console>

TypeError: data type not understood

Also:

In [6]: numpy.zeros((3,), dtype=3D'(2,)u1')
=2D------------------------------------------------------------------------=
=2D-
exceptions.ValueError                                Traceback (most recent=
=20
call last)

/home/faltet/python.nobackup/numpy/<ipython console>

/usr/lib/python2.4/site-packages/numpy/core/_internal.py in _commastring(as=
tr)
    296     res =3D _split(astr)
    297     if (len(res)) =3D=3D 1:
=2D-> 298         raise ValueError, "no commas present"
    299     result =3D []
    300     for k,item in enumerate(res):

ValueError: no commas present

Perhaps this is the same case as defining tables with just one column?

=2D-=20
>0,0<   Francesc Altet =A0 =A0 http://www.carabos.com/
V   V   C=E1rabos Coop. V. =A0=A0Enjoy Data
 "-"