why doesn't this animation work?

Brian_Blais · November 14, 2009, 8:21pm

Hello,

I was wondering why the following animation doesn’t work. I thought it did work before, but perhaps I am misremembering. I am on OS X 10.4, matplotlib version 0.99.0 from the enthought distribution. I must be thinking about this wrong someone, but I thought that if you did a plot, then updated the data on the plot object, and called draw that it would actually draw it (like it does in matlab). right now it just gives me a blank figure, with a busy mouse icon, and then shows the last plot done.

thanks,

		Brian Blais

import numpy

import matplotlib.pyplot as plt

h,=plt.plot([1,2,3])

plt.ylabel(‘some numbers’)

plt.show()

for i in range(100):

h.set_ydata(numpy.random.rand(3)*2+1)

plt.draw()

···

–

Brian Blais

bblais@…1129…

http://web.bryant.edu/~bblais

_Jae-Joon_Lee1 · November 14, 2009, 10:40pm

What backend are you using?

There was a similar report that the "draw" method of the qt4agg
backend does not update the screen immediately but wait until it gets
idle.
See if using other backends makes any change.

-JJ

···

On Sat, Nov 14, 2009 at 3:21 PM, Brian Blais <bblais@...1129...> wrote:

Hello,
I was wondering why the following animation doesn't work. I thought it did
work before, but perhaps I am misremembering. I am on OS X 10.4, matplotlib
version 0.99.0 from the enthought distribution. I must be thinking about
this wrong someone, but I thought that if you did a plot, then updated the
data on the plot object, and called draw that it would actually draw it
(like it does in matlab). right now it just gives me a blank figure, with a
busy mouse icon, and then shows the last plot done.
thanks,
Brian Blais

import numpy
import matplotlib.pyplot as plt
h,=plt.plot([1,2,3])
plt.ylabel('some numbers')
plt.show()
for i in range(100):
h.set_ydata(numpy.random.rand(3)*2+1)
plt.draw()

--
Brian Blais
bblais@...1129...
bblais on the web

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Brian_Blais · November 15, 2009, 12:09am

What backend are you using?

ah! it seems to work with the tkagg backend, but not the wxagg backend.

I am using ipython with the -pylab flag.

I remember having some problem with the tk backend (perhaps when I was doing some wx embedding), but I can’t recall what it was. is there a reason the wx backend doesn’t work as I expect?

on a related note, is there a way in ipython to specify the backend for the -pylab flag, overriding the one specified in matplotlibrc?

	thanks,

		bb

There was a similar report that the “draw” method of the qt4agg

backend does not update the screen immediately but wait until it gets

idle.

See if using other backends makes any change.