PS. In the code just disregard the line N = 1000 - it does nothing. Ghose, Kaushik wrote: > Hi John, > > OK. I've managed to pare it down to the following pattern: > > import pylab > > N = 1000 > x = pylab.zeros(200) > x[1] = .5 > x[2:24] = 1.0 > x[24] = .5 > x[26] = -.5 > x[27:49] = -1.0 > x[49] = -.5 > x = pylab.tile(x, 100) > pylab.plot(x) > > > The above code is sufficient to repeat the glitch (just resize the window to > check this). The half-way values (0.5) are important - if we have a straight > jump the glitch isn't visible. > > I'm sorry but I couldn't find path.py under > > /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/ > > so I couldn't try it out. (Is it under a different place in mac?) > > thanks > -Kaushik > > > > John Hunter wrote: >> On Sat, Dec 27, 2008 at 10:29 AM, Kaushik Ghose >> <kaushik_gh...@hms.harvard.edu> 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! > > ------------------------------------------------------------------------------ > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
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