Benjamin Root on my suggestion that one can use del instead of remove :
There are methods for ax that properly handle removal of types of
artists that have been attached to an axes. The above approach
assumes that no other collections have been plotted that you wanted to
keep. The approach I gave is a very surgical method that makes sure
that only what is supposed to be removed gets removed. Both are
valid, and their usefulness depends upon which view of the data you
need (remove types of artists versus removing particular artists).
Yes, absolutely.
With just a little remark: remove is a Python function which *searches*
the list for a given value. del uses indices, so
del lst[10000]
will be most probably faster than lst.remove(value), if this value
happens to occur for the first time at index 10000. Unless Matplotlib
uses a specially tuned version of remove.
Under Windows XP, ion() is not too
compatible with show().
TKAgg (by default), WXAgg and GTKAgg bomb Bens program (and without
draw() nothing is plotted).
That would be a bug and should be reported (assuming that it is in the
latest version). Make sure that you are using at least v1.0.1
(preferably v1.1.0) to make sure that show() should do what you want.
Any version earlier than v1.0.1 is very unpredictable with respect to
multiple show() calls.
I use 1.1.0. (Python 2.7.2) I didn't report any bug because I didn't
know whether this was a bug...
But there are more...
The animation module uses various timers depending on the back-end. This
is -- perhaps -- the result of the fact that Python standard Timer (a
subclass of Thread) is, to say it mildly, rather weak. So, under Tk the
system uses after(), wx offers its timers, etc. Timed animation works
differently under various backends.
Here:
http://users.info.unicaen.fr/~karczma/TEACH/Test/isingVZ.py
is a program which simulates/visualizes a simple-minded 2D Ising model
(vectorized Metropolis Monte-Carlo; not *exactly* physical, but only
mister Nobody is perfect...). It should update the picture dynamically,
and my students can see how the ferromagnetic domains develop.
When run with Tk, OK. GTK and wx -- no. The animation runs, but the
figure is frozen for many seconds, and it is updated when the Slider is
activated. The autonomous refreshing of the image is much much slower
than under TK. I don' understand what is happening...
Tested on Windows XP, and under Linux (Fedora). I repeat, the animation
runs, this is a problem of refreshing the display.
Thank you, and all the best.
Jerzy Karczmarczuk
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