Clearing A Figure (I Know That This Has Been Posted Before But I Does Not Work For Me)

Community matplotlib-users
#1

I am attempting to run a lot of tests automatically and generate a graph for
each one. However, at the moment, the previous graph remains on the figure
and the next plot is drawn over it.

I have read extensively the documentation and I have tried a whole lot of
different commands but to no avail. In the previous post it said to use
pylab.clf() which is exactly what I've been trying to use.

So far I have used pylab.cla(), pylab.clf() and pylab.close() although I
believe that this only closes an open figure window. I have no idea why it
is not working now especially since it would appear that my question had
already been answered in both the documentation and the forums.

I am using Python 2.6.4 on Ubuntu Linux.

Here is the relevant code I am using:
  pylab.plot(xAxis, TrainingPoints, 'b-')

  pylab.plot(xAxis, TestPoints, 'r-')

  pylab.xlabel('Epochs')

  pylab.ylabel('Sum Squared Error')

  pylab.title('Plot of Iris Training Errors')

  outfilename = str(int(LEARNING_RATE)) + ".png"
  print outfilename
  pylab.ylim(ymin=0)
  pylab.savefig(outfilename)
  pylab.cla()
  pylab.clf()

I really hope one of you can spot an error otherwise I am completely stuck.

···

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#2

w/o seeing the entire code it is difficult to diagnose. Nothing looks
wrong with your code. However, for full control I suggest you use the
API; see examples at
http://matplotlib.sourceforge.net/examples/api/index.html and take a
look at the "artist tutorial" at
http://matplotlib.sourceforge.net/users/artists.html.

In a nutshell

fig = plt.figure()
ax = fig.add_subplot(111)
for param in myparams:
    fig.clf()
    ax.plot(something_with(param))
    ax.set_ylabel('Sum Squared Error')
    ax.set_title('Plot of Iris Training Errors')
    ax.set_ylim(ymin=0)
    outfilename = '%d.png'%param
    fig.savefig(outfilename)

···

On Tue, May 25, 2010 at 4:08 AM, Thistleryver <mhar244@...3120...> wrote:

I am attempting to run a lot of tests automatically and generate a graph for
each one. However, at the moment, the previous graph remains on the figure
and the next plot is drawn over it.

I have read extensively the documentation and I have tried a whole lot of
different commands but to no avail. In the previous post it said to use
pylab.clf() which is exactly what I've been trying to use.

So far I have used pylab.cla(), pylab.clf() and pylab.close() although I
believe that this only closes an open figure window. I have no idea why it
is not working now especially since it would appear that my question had
already been answered in both the documentation and the forums.

I am using Python 2.6.4 on Ubuntu Linux.

Here is the relevant code I am using:
pylab.plot(xAxis, TrainingPoints, 'b-')

   pylab\.plot\(xAxis, TestPoints, &#39;r\-&#39;\)

   pylab\.xlabel\(&#39;Epochs&#39;\)

   pylab\.ylabel\(&#39;Sum Squared Error&#39;\)

   pylab\.title\(&#39;Plot of Iris Training Errors&#39;\)

   outfilename = str\(int\(LEARNING\_RATE\)\) \+ &quot;\.png&quot;
   print outfilename
   pylab\.ylim\(ymin=0\)
   pylab\.savefig\(outfilename\)
   pylab\.cla\(\)
   pylab\.clf\(\)
#3

w/o seeing the entire code it is difficult to diagnose. Nothing looks
wrong with your code. However, for full control I suggest you use the
API; see examples at
http://matplotlib.sourceforge.net/examples/api/index.html and take a
look at the "artist tutorial" at
http://matplotlib.sourceforge.net/users/artists.html.

Thank you. The tutorial was very helpful. For a moment I thought I might
have found the answer with the lines.remove() function but alas, it did not
make a difference yet again. :frowning: I am starting to feel that this is a
problem with my setup rather than my code. I may have to try this on
someone else's computer.

In a nutshell

fig = plt.figure()
ax = fig.add_subplot(111)
for param in myparams:
   fig.clf()
   ax.plot(something_with(param))
   ax.set_ylabel('Sum Squared Error')
   ax.set_title('Plot of Iris Training Errors')
   ax.set_ylim(ymin=0)
   outfilename = '%d.png'%param
   fig.savefig(outfilename)

This is almost exactly the same as something else I have tried but this is
all to no avail. I have posted all of my code at
http://code-bin.homedns.org/653 if anyone has time to look at it.

···

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