Re: [Matplotlib-users] Matplotlib/Pylab... A Couple Of Problems...

[John H. <jdh...@ac...>]

>>>>> "andrea" == andrea gavana <and...@ti...> writes:

    andrea> No matter which is my choice, the window crashes and I get
    andrea> the usual XP message about sending error messages to
    andrea> Microsoft and so on. It is a strange exception, if I
    andrea> resize the window VERY slowly, there is no exception
    andrea> (usually).

There is a known bug in Agg on Windows XP that appears on repeated
draws (resizing does this) that causes a segmentation fault.  I've
only seen this in the context of draw markers (eg

  plot(x,y,'o') 

where 'o' is a plot marker symbol.  Do you have markers in your plot?

Unfortunately, even though I think I know where the bug is occurring,
I don't yet have a fix for it.  If it is too annoying, you may want to
roll back to 0.71 until I figure this one out.


    andrea> Problem 2: Considering always the keypress_demo.py, if I
    andrea> run it (without resizing the window ;-) ) and I press the
    andrea> key "g" (for the grid), the grid appears and suddenly
    andrea> disappears. I opened the keypress_demo.py and I commented
    andrea> out the draw() command (that follows the grid() command),
    andrea> and now the grid does not disappear. What could be the
    andrea> problem with draw()?!? I have to use it in my application,
    andrea> but I am not able to display the grid...


Oh, I get it :-)

the 'g' key is now a default part of matplotlib -- eg pressing 'g'
toggles the grid on any axes.  I wrote the keypress_demo before making
this behavior default, so what you see in the demo is that you toggle
grid two times in keypress_demo, once in the default axes handling,
and once in the demo.  And so it ends up turning it on and back off.
Time to update the demo!

    andrea> Thank your for every suggestion, and sorry for the long
    andrea> post.

Bug reports are always welcome -- thanks!

JDH