[Numpy-discussion] numpy.complex
Scott Sinclair
scott.sinclair.za at gmail.com
Wed Jul 18 10:45:28 EDT 2012
On 18 July 2012 15:14, Molinaro Céline
<celine.molinaro at telecom-bretagne.eu> wrote:
> Hello,
>
> In [2]: numpy.real(arange(3))
> Out[2]: array([0, 1, 2])
> In [3]: numpy.complex(arange(3))
> TypeError: only length-1 arrays can be converted to Python scalars
I think you're looking for the dtype keyword to the ndarray constructor:
import numpy as np
np.arange(3, dtype=np.complex)
Out[2]: array([ 0.+0.j, 1.+0.j, 2.+0.j])
or if you have an existing array to cast:
np.asarray(np.arange(3), dtype=np.complex)
Out[3]: array([ 0.+0.j, 1.+0.j, 2.+0.j])
You can get the real and imaginary components of your complex array like so:
a = np.arange(3, dtype=np.complex)
a
Out[9]: array([ 0.+0.j, 1.+0.j, 2.+0.j])
a.real
Out[10]: array([ 0., 1., 2.])
a.imag
Out[11]: array([ 0., 0., 0.])
Cheers,
Scott
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