[Numpy-discussion] reinterpret complex <-> float
Warren Weckesser
warren.weckesser at enthought.com
Fri Jun 3 14:56:46 EDT 2011
On Fri, Jun 3, 2011 at 1:46 PM, Neal Becker <ndbecker2 at gmail.com> wrote:
> Can I arrange to reinterpret an array of complex of length N as an array of
> float of length 2N, and vice-versa? If so, how?
>
You can use the view() method (if the data is contiguous):
In [14]: z = array([1.0+1j, 2.0+3j, 4, 9j])
In [15]: x = z.view(float64)
In [16]: x
Out[16]: array([ 1., 1., 2., 3., 4., 0., 0., 9.])
But this won't work if the data in the array is not contiguous:
In [17]: z2 = z[::2]
In [18]: z2
Out[18]: array([ 1.+1.j, 4.+0.j])
In [19]: z2.view(float64)
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
/Users/warren/<ipython console> in <module>()
ValueError: new type not compatible with array.
(I'm using ipython with the -pylab option; 'array' and 'float64' are from
numpy.)
Warren
>
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