[Numpy-discussion] Float view of complex array

[Sebastian Berg]

On Mo, 2015-01-26 at 09:24 +0100, Jens Jørgen Mortensen wrote:
> Hi!
> 
> I have a view of a 2-d complex array that I would like to view as a 2-d 
> float array.  This works OK:
> 
>  >>> np.ones((2, 4), complex).view(float)
> array([[ 1.,  0.,  1.,  0.,  1.,  0.,  1.,  0.],
>         [ 1.,  0.,  1.,  0.,  1.,  0.,  1.,  0.]])
> 
> but this doesn't:
> 
>  >>> np.ones((2, 4), complex)[:, :2].view(float)
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> ValueError: new type not compatible with array.
>  >>> np.__version__
> '1.9.0'
> 
> and I don't understand why.  When looking at the memory layout, I think 
> it should be possible.
> 

Yes, it should be possible, but it is not :). You could hack it by using
`np.ndarray` (or stride tricks). Or maybe you are interested making the
checks whether it makes sense or not less strict.

- Sebastian

> Jens Jørgen
> 
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