Re: [Numpy-discussion] array of tuples

[Stefan v. d. W. <st...@su...>]

On Tue, Jun 06, 2006 at 01:05:43PM -0500, Travis N. Vaught wrote:
> looping).  Is there a quick way to do this with dtype?
>=20
> I've tried:
>=20
>  >>> import numpy
>  >>> x =3D [(1,2,3),(4,5,6)]
>  >>> numpy.array(x)
> array([[1, 2, 3],
>        [4, 5, 6]])
>  >>> numpy.array(x, dtype=3D'p')
> array([[1, 2, 3],
>        [4, 5, 6]])
>  >>> numpy.array(x, dtype=3D'O')
> array([[1, 2, 3],
>        [4, 5, 6]], dtype=3Dobject)

It works if you pre-allocate the array:

In [18]: x =3D [(1,2),(3,4)]

In [19]: z =3D N.empty(len(x),dtype=3D'O')

In [20]: z[:] =3D x

In [21]: z
Out[21]: array([(1, 2), (3, 4)], dtype=3Dobject)

Regards
St=E9fan