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    <p>I have new information about this that a google search turned up</p> <p>This is from the writer of matplotlib. This came from <a href="http://old.nabble.com/calling-show%28%29-twice-in-a-row-td24276907.html" rel="nofollow">http://old.nabble.com/calling-show%28%29-twice-in-a-row-td24276907.html</a></p> <blockquote> <p>Hi Ondrej,</p> <p>I'm not sure where to find a good explanation of that, but let me give you some hints. It is intended to use show only once per program. Namely 'show' should be the last line in your script. If you want interactive plotting you may consider interactive mode (pyplot.ion-ioff) like in the example below.</p> <p>Furthermore for dynamic plotting all animation demos might be useful.</p> <p>Maybe you want to have also a look at <a href="http://matplotlib.sourceforge.net/users/shell.html" rel="nofollow">http://matplotlib.sourceforge.net/users/shell.html</a> .</p> <p>best regards Matthias</p> </blockquote> <p>So it seems it is an undocumented "feature" (bug?).</p> <p>Edit: here is his code block:</p> <pre><code>from pylab import * t = linspace(0.0, pi, 100) x = cos(t) y = sin(t) ion() # turn on interactive mode figure(0) subplot(111, autoscale_on=False, xlim=(-1.2, 1.2), ylim=(-.2, 1.2)) point = plot([x[0]], [y[0]], marker='o', mfc='r', ms=3) for j in arange(len(t)): # reset x/y-data of point setp(point[0], data=(x[j], y[j])) draw() # redraw current figure ioff() # turn off interactive mode show() </code></pre> <p>So maybe by using draw() you can get what you want. I haven't tested this code, I'd like to know its behavior.</p>
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    1. COAs my first example, it works perfectly in a separate script but into my function it works only the first time but not the second one. The problem is the final show() that can be called only once. It's so strange, I just need to open and close a figure several time, it should not be so difficult. I guess that somehow the inclusion into a qt widget can lead to this behavior. By the way, using only draw() without show() doesn't display anything.
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