On 1/8/2012 2:29 AM, Eric Firing wrote:
> On 01/07/2012 07:01 PM, Ethan Swint wrote:
>> Hi, list-
>>
>> This question has been asked before, but all of my search results don't
>> address my problem:
>> <code>
>> fig = figure(1, figsize=(3.25, 3))
>> plot([0,1,5,2,9])
>> title('title')
>> xlabel('xAxis')
>> ylabel('yAxis')
>> fig.savefig('test.png',dpi=600)
>> </code>
>> The resulting figure is 2040x1890 pixels, or 3.4"x3.15", and the xlabel
>> is cut off. Looking at the PNG file in an image editor, it appears that
>> the axes and ticklabels fit the desired size. I've tried taking the
>> difference from the output size and requested size and feeding that back
>> in (3.25 - (3.4-3.25) = 3.10, but matplotlib seems to add an arbitrary
>> buffer and it still doesn't come out to the desired size. How does one
>> make an overall figure that is the desired size?
> Ethan,
>
> There seem to be two questions here. First, when I run your code, I get
> a png file of the right size:
> test.png: PNG image data, 1950 x 1800, 8-bit/color RGBA, non-interlaced
>
> What version of mpl are you using? I don't recall that it ever had the
> property you are reporting, generating a larger figure than requested.
>
> The second question is about the xlabel getting cut off. This is
> happening because mpl is using default subplot parameters that leave
> plenty of space for tick labels and axis labels with the default figure
> size, but don't leave enough if the figure is much smaller, and leave
> too much if the figure is much bigger. The subplot parameters are
> expressed as fractions of the figure size, but the text does not scale
> automatically with the figure size. Therefore you have to either
> specify the Axes position manually to leave the right size margins, or
> use subplots_adjust. When a figure is displayed on the screen, there is
> a button on the toolbar that brings up a subplots_adjust widget; this
> can be used to find values appropriate for your figure size, which you
> can then supply to your script. In the standard set of mpl examples
> there are many instances of subplots_adjust, e.g.,
> http://matplotlib.sourceforge.net/examples/pylab_examples/subplots_adjust.html
Eric-
Thanks for your reply. I actually had the MPL version copied, but
somehow I forgot to paste it: matplotlib.__version__ is 1.0.1 on Python
2.7.2, Ipython v. 0.11, on Windoze 7 x64. Around 2AM I found that if I
called fig.set_size_inches(3.25,3) just before calling fig.savefig(), it
did produce the proper size image.
For your viewing pleasure, on my system I get:
<code>
In [228]: fig = figure(3, figsize=(3.15, 3.15))
In [229]: fig.savefig('test0.png',dpi=600)
In [230]: fig.get_size_inches()
Out[230]: array([ 3.3, 3.3])
<\code>
The output is indeed 3.3"x3.3" (1980x1980). I'll upgrade to MPL 1.1.0
and see if that helps the initial size problem.
As for subplots_adjust - I'll have to dig into that. Will I need to
make my figure with subplot(111) instead of figure()? Hmm - off to
experiment.
Thanks,
Ethan
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