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

[Michael D. <md...@st...>]

I'm having trouble getting your C code to compile (maybe a gsl version 
mismatch...?)

In the meantime, perhaps you could try something for me.

If you add the kwarg "solid_joinstyle='bevel'" or 
"solid_joinstyle='round'" to your plot command, does that improve 
things?  If so, we could consider changing the default.

Cheers,
Mike

mtcoder wrote:
> 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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>   

-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA