I think this was just an oversight in the refactoring of transformations 
for 0.98.  This should work now in SVN r5716.  Look here if you want to 
patch your local copy -->

http://matplotlib.svn.sourceforge.net/viewvc/matplotlib?view=rev&revision=5716

Cheers,
Mike

Matthew Turk wrote:
> Hi there,
>
> I'm attempting to port some code over to matplotlib 0.98.x.
> Previously, I was able to do something like:
>
> axes_object.pcolormesh(x,y,v)
> axes_object.set_xscale('log')
> axes_object.set_yscale('log')
>
> and then save the figure.  However, now this fails because the
> sequence of transformations it applies is not affine.  (assert
> transform.is_affine in collections.py:QuadMesh.)  If I want to have
> the same effect -- a log-spaced pcolormesh -- what is the appropriate
> sequence of calls?  I'd like to avoid pre-applying the log and
> plotting on a linear-scale plot, as the code also overplots analytic
> functions in the same figure.
>
> Thanks!
>
> -Matt
>
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA


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