Re: [Matplotlib-users] Fuzzy plots of ode solutions

[mtcoder <jbe...@gm...>]

All, 

Thanks for the quick and informative responses. I've attached the code
(testode.c). It requires the GSL library. I've also attached the script I
was using to read and plot the data (odetest.py). [Note: If you do any tests
with the python script make sure to change the savefig directory in plot()
to something local. ]

http://www.nabble.com/file/p20996825/testode.zip testode.zip  test code

John: I'm using evince to view pdf's (but acroread produces the same
behavior as Michael's attachments showed). 

Michael: I changed the backend to Cairo and saved the figures directly to
pdf. Same results. To be clear, to do this I changed the matplotlibrc file
(backend GTKAgg -> Cairo) and then changed the filename in savefig to end
with ".pdf". I assume that is what you had in mind. 

In addition, as requested here are two screenshots in png format of the
actual pylab/matplotlib output:

http://www.nabble.com/file/p20996825/odetest_pylabimg.png
odetest_pylabimg.png  output
http://www.nabble.com/file/p20996825/odetest_pylabimg_zoom.png
odetest_pylabimg_zoom.png  output zoomed. 

Thanks for the help,
-Jesse


Michael Droettboom-3 wrote:
> 
> Also -- for mtcoder:
> 
> Can you send us the script that generates your plot?
> 
> Also, if you set your backend to Cairo, and then generate the pdf, to 
> you get the same result?
> 
> Cheers,
> Mike
> 
> Michael Droettboom wrote:
>> There's something funny going on with line caps, maybe?  It looks like 
>> the corners aren't getting capped in the same way as Agg does.
>>
>> I've created screenshots of Jesse's pdf file in acrobat and evince.
>>
>> Any thought, Jouni?
>>
>> Cheers,
>> Mike
>>
>> John Hunter wrote:
>>> On Thu, Dec 11, 2008 at 11:16 PM, mtcoder <jbe...@gm...> wrote:
>>>
>>>  
>>>> http://www.nabble.com/file/p20970084/testode.rk45.a0.99.eps1e-07.pdf
>>>> testode.rk45.a0.99.eps1e-07.pdf . This comes from a completely 
>>>> deterministic
>>>> ode. But is looks like I've added a tiny amount of noise.
>>>>
>>>> On a technical note, I'm running Ubuntu 8.04, python2.5.1, 
>>>> matplotlib0.91.2
>>>> (with GTKAgg backend).
>>>>
>>>> (Hopefully I didn't miss a similar question--and solution--elsewhere 
>>>> in the
>>>> forum.)
>>>>     
>>>
>>> My guess is that you may be seeing the antialiasing of your pdf
>>> renderer.  matplotlib has a pretty good antialiasing renderer for the
>>> screen display (antigrain) but your mileage may vary for your pdf
>>> renderer.  Since pdf is a vector output, we have no control over the
>>> renderering.  What pdf viewer are you using?  The best way for us to
>>> see what you are seeing is to take a PNG screenshot of your PDF file
>>> displayed in your viewer and then post the PNG.  Ie, here is what I am
>>> seeing in the Preview app: the fuzziness is from the antialiasing, but
>>> I am used to seeing this.
>>>  
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