Thanks for narrowing this down.  I have (hopefully) fixed this in r6864.

Cheers,
Mike

João Luís Silva wrote:
> Michael Droettboom wrote:
>> Thanks for the report.  I'm not actually able to reproduce this here 
>> -- though I suspect this could be related to the recent path 
>> simplification changes.
>>
>> Taking a stab in the dark -- have you tried removing the build 
>> directory and rebuilding?  distutils doesn't do dependency-tracking, 
>> so if header files change it often doesn't rebuild enough.
>>
>
> I didn't remove the build subdirectory, but always did a python 
> setup.py clean / remove all mpl stuff from site-packages. Anyway, this 
> time I did remove the build subdirectory but the problem remains. The 
> bug seems to be backend independent and is there since the first 
> support of markevery, on revision 6631. The problem seems to be that 
> the function draw() of Line2D keeps removing the n-th marker for 
> markevery=n, even if it has already done so. I tried to reproduce this 
> on Windows, but the latest release (0.98.5) doesn't support markevery.
>
> My 32-bit Ubuntu installation is pretty standard. I could reproduce 
> this on two different computers with the same Ubuntu 8.10 and mpl svn.
>
> If I run this script, select the pan/zoom tool and just click on the 
> plot (not dragging, just left clicking in place) each click will 
> remove every second marker until there are no markers left.
>
> ------------------------------------------
> import matplotlib.pyplot as pl
> import numpy as np
>
> pl.plot(np.arange(100.0),np.arange(100.0),marker="+",markevery=2)
> pl.show()
> ------------------------------------------
>
> Best regards,
> João Silva

-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA


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