On Tue, May 26, 2009 at 7:39 AM, Michael Droettboom <md...@stsci.edu> wrote:
> Does it help if you add a call to "plt.clf()" to the bottom of the loop?
>
> The pyplot interface keeps a reference around to every figure created
> until they are destroyed so that it can be obtained again by number
> (this is functionality inspired by matlab). Alternatively, you can use
> the object-oriented interface to create the figure, which does not have
> this behavior, e.g., replace
>
> fig = plt.figure()
>
> with
>
> from matplotlib import figure
> fig = figure.Figure()
>
> If all this doesn't help, let me know and I'll look further.
>
> Cheers,
> Mike
>
> iCy-fLaME wrote:
>> I was trying to use matplotlib to plot a series of 2D images, but
>> python was using up a large amount of RAM very quickly. I don't know
>> matplotlib that well, so the chance are I am missing something, would
>> appreciate it if anyone can point me to the right direction.
>>
>> I am using:
>> Python 2.4.3 (#1, Jan 21 2009, 01:11:33)
>> [GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] on linux2
>>
>> Example code to run in interpreter mode:
>>
>> ########################################
>> from numpy import zeros
>>
>> x = 1651
>> y = 452
>> page = zeros((x, y)).astype('float')
>>
>> import matplotlib
>> matplotlib.use('Agg')
>> import matplotlib.pyplot as plt
>>
>> for i in range(1000):
>> fig = plt.figure()
>> ax = fig.add_subplot(111)
>> cax = ax.imshow(page, cmap=plt.cm.spectral_r, extent=(-44, 176, -30,
>> 30), interpolation = 'bicubic', vmin = -0.003, vmax = 0.003)
>> title = "Time = %(i)0.3es)" % {'i':i}
>> ax.set_title(title,fontsize=14)
>>
>> fig.colorbar(cax, ticks=[-2e-3, -1e-3, 0, 1e-3, 2e-3],
>> orientation='horizontal')
>>
>> fig.savefig('_tmp.' + str(i) + ".png", dpi=300)
This code creates 1000 different figures -- either reuse the same
figure and clear it as Michael suggests
fig = plt.figure(1) # by putting 1 here you reuse the same fig
fig.clf() # and clear it
or close the figure in the loop
fig = plt.figure()
# draw and save here
plt.close(fig)
JDH
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