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

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

In the meantime, I was able to get everything working and could confirm.

Passing solid_joinstyle='bevel' does resolve the problem on both 0.91.x 
and 0.98.x.  Additionally, path simplification (which is a new feature 
on 0.98.x) also resolves this problem (set rcParam path.simplify to True).

The wider question is:

    a) should bevel be the default going forward?
    b) maybe this deserves a FAQ entry

Mike

Jesse Berwald wrote:
> I compiled the code with following:
>
> gcc -o testode.o testode.c -lm -lgsl -lgslcblas
>
> I'm using gsl 1.10. Hope that helps. I'll try out the kwarg suggestions asap.
>
> Thanks for the help,
> -Jesse
>
> On Mon, Dec 15, 2008 at 9:38 AM, Michael Droettboom <md...@st...> wrote:
>   
>> 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
>>
>>
>>     
>
>
>
>   

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