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

[Jesse B. <jbe...@gm...>]

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
>
>



-- 
PhD Candidate
Department of Mathematics
Montana State University
Bozeman, MT