[Numpy-discussion] Second try: possible bug in assignment to complex array

[josef.pktd at gmail.com]

On Fri, Aug 10, 2012 at 10:00 AM, Travis Oliphant <travis at continuum.io>wrote:

>
> On Aug 10, 2012, at 5:37 AM, Paul Anton Letnes wrote:
>
> >
> >
> > On 10. aug. 2012, at 09:54, Mark Bakker wrote:
> >
> >> I am giving this a second try. Can anybody help me out?
> >>
> >> I think there is a problem with assigning a 1D complex array of length
> one
> >> to a position in another complex array.
> >>
> >> Example:
> >>
> >> a = ones(1,'D')
> >> b = ones(1,'D')
> >> a[0] = b
> >>
> ---------------------------------------------------------------------------
> >> TypeError                                 Traceback (most recent call
> last)
> >> <ipython-input-37-0c4fc6d780e3> in <module>()
> >> ----> 1 a[0] = b
> >>
> >> TypeError: can't convert complex to float
> >>
> >> This works correctly when a and b are real arrays:
> >>
> >> a = ones(1)
> >> b = ones(1)
> >> a[0] = b
> >>
> >> Bug or feature?
> >
> > The exact same thing happens on OS X 10.7.4, python 2.7.3, numpy 1.6.1.
> >
> > Looks like a bug to me - or at least very surprising behavior.
>
> This is definitely an inconsistency.    The error seems more correct
> (though the error message needs improvement).
>
> Can someone try this on NumPy 1.5 and see if this inconsistency existed
> there as well.
>

>>> np.__version__
'1.5.1'

>>> a = np.ones(1,'D')
>>> b = np.ones(1,'D')
>>> a[0] = b
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can't convert complex to float
>>> a = np.ones(1)
>>> b = np.ones(1)
>>> a[0] = b

Josef


> Thanks,
>
> -Travis
>
> >
> > Paul
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>
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