matplotlib.pyplot.draw() and matplotlib.pyplot.show() have no effect

Question

In the past I was able to do simple animations with matplotlib with a for loop, but this hasn't worked for some time now.

The standard answer is that you have to turn interactive mode on and/or force a redraw with matplotlib.pyplot.draw(). Here is my minimal working example:

import numpy as np
import matplotlib

matplotlib.use('Qt4Agg')

import matplotlib.pyplot as mplot

mplot.ion()

fig = mplot.figure(1)
ax = fig.add_subplot(111)

for ii in np.arange(0,10):
    x = 200*np.random.rand(30)
    ax.plot(x)
    mplot.draw()
    filename = ("img_%d.png" % ii)
    mplot.savefig(filename)

When I run this in Interactive Python Editor, I get one figure at the very end with all the plots in it (this also happens with mplot.show())

When I run this in IPython 3.1 (with Python 3.3.5) from the command line, I get nothing at all.

The mplot.savefig(filename) line does seem to work, as the images are generated.

(It's possible this is a bug in the Qt4 backend.)

Community · Accepted Answer · 2017-05-23 12:14:25Z

2

Try deleting the line matplotlib.use('Qt4Agg'). Works for me. Also works with matplotlib.use('TkAgg'). So it is a backend problem. There is another way to do animations.

edited May 23, 2017 at 12:14

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answered May 25, 2015 at 19:47

Mike Müller

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1 Comment

Stephen Bosch Over a year ago

So you tried it with matplotlib.use('Qt4Agg') and it didn't work for you either?

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