Downloaded latest svn numpy and matplotlib and it works perfectly now.
Thanks for sorting it out so quickly.

George.

2009/1/20 Eric Firing <efir...@hawaii.edu>:
> George Nurser wrote:
>>
>> I think there may be two bugs in quiver.
>
> Actually just 1...
>
>>
>> 1. Quiver doesn't seem to accept 1D arrays X and Y if they are
>> different sizes -- they need to be turned into 2d arrays with meshgrid
>> for the program to work. With line 13 uncommented I get the following
>> error message:
>
> This is a bug.  It is fixed now in svn trunk and 98.5 maintenance branch.
>
>>
>> 2. Masking is not working properly with quiver, while it works fine
>> with contour -- see the attached quivtest.png
>
> This is a numpy.ma bug that has been fixed in numpy.  I don't know exactly
> when it was fixed, but after I tracked it down to numpy.ma, I updated my
> copy of numpy from svn, and the problem went away.  Somehow, when a
> multiplication was done with broadcasting, the mask was getting handled and
> propagated incorrectly.  I suspect this bug was present only for a moderate
> interval of time, because quiver with masked points worked for a long time
> before you ran into the bug.
>
> Eric
>

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