matplotlib-users Mailing List for matplotlib

On Sat, Dec 27, 2008 at 10:29 AM, Kaushik Ghose
<Kau...@hm...> wrote:
> Hi Gang,
>
> I was plotting some data collected from an ADC and noticed an odd aliasing
> issue. Please see the images on the following site.
>
> http://assorted-experience.blogspot.com/2008/12/odd-aliasing-issue-with-matplotlib.html
>
> I wonder if there is any way to avoid this kind of aliasing. I vaguely remember
> our old arch-foe (MATLAB) handles this gracefully. I have found matplotlib's
> plotting to be superior to MATLAB's in every way (except for 3D) and it would be
> nice if aliasing could be handled gracefully.

I'm almost certain this is a result of the path simplification logic.
Could you upload some sample data and a self contained script so we
can test?
You can test this by editing site-packages/path.py and replacing::

  self.should_simplify = (len(vertices) >= 128 and
                                (codes is None or np.all(codes <= Path.LINETO)))

with::

  self.should_simplify = False

Michael, perhaps we could override path.should_simplify with an rc or
line property?

> Also, thanks for the excellent binary packages for Mac!

Thanks for testing them!

Hi Gang,

I was plotting some data collected from an ADC and noticed an odd aliasing 
issue. Please see the images on the following site.

http://assorted-experience.blogspot.com/2008/12/odd-aliasing-issue-with-matplotlib.html

I wonder if there is any way to avoid this kind of aliasing. I vaguely remember 
our old arch-foe (MATLAB) handles this gracefully. I have found matplotlib's 
plotting to be superior to MATLAB's in every way (except for 3D) and it would be 
nice if aliasing could be handled gracefully.

Also, thanks for the excellent binary packages for Mac!

Many thanks
-Kaushik