[Numpy-discussion] Is this a bug in numpy.ma.reduce?

David Goldsmith d.l.goldsmith at gmail.com
Fri Mar 5 12:22:58 EST 2010

On Fri, Mar 5, 2010 at 2:51 AM, Pierre GM <pgmdevlist at gmail.com> wrote:

> On Mar 5, 2010, at 4:38 AM, David Goldsmith wrote:
> > Hi!  Sorry for the cross-post, but my own investigation has led me to
> suspect that mine is actually a numpy problem, not a matplotlib problem.
>  I'm getting the following traceback from a call to matplotlib.imshow:
> > ...
> > Based on examination of the code, the last self is an instance of
> ma._extrema_operation (or one of its subclasses) - is there a reason why
> this class is unable to deal with a "zero-size array to ufunc.reduce without
> identity," (i.e., was it thought that it would - or should - never get one)
> or was this merely an oversight?  Either way, there's other instances on the
> lists of this error cropping up, so this circumstance should probably be
> handled more robustly.  In the meantime, workaround?
> 'm'fraid no. I gonna have to investigate that. Please open a ticket with a
> self-contained example that reproduces the issue.

I'll do my best, but since it's a call from matplotlib and I don't really
know what's causing the problem (other than a literal reading of the
exception) I'm not sure I can.


> Thx in advance...
> P.
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