[Numpy-discussion] real and imag functions should produce errors for object arrays

Benjamin Root ben.root@ou....
Tue Sep 21 16:44:21 CDT 2010


On Tue, Sep 21, 2010 at 4:31 PM, Michael Gilbert <
michael.s.gilbert@gmail.com> wrote:

> Hi,
>
> The following example demonstrates a rather unexpected result:
>
> >>> import numpy
> >>> x = numpy.array( complex( 1.0 , 1.0 ) , numpy.object )
> >>> print x.real
> (1+1j)
> >>> print x.imag
> 0
>
> Shouldn't real and imag return an error in such a situation?
>
> Thanks,
> Mike
>

Don't use 'numpy.object'.  Because complex is a  numerical type, numpy can
handle it just fine.  By setting dtype to numpy.object, numpy then treats it
like an object rather than a numerical.

x = numpy.array( complex(1.0, 1.0) )

should work just fine.

I hope that helps!
Ben Root
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