You didn't mention the version of matplotlib you are using. There are some known bugs using NaNs on 0.90.x and 0.91.x that have been fixed on the trunk. Unfortunately, it will be difficult to backport these fixes.
Have you tried using masked arrays instead of arrays with NaNs? Also, can you provide a standalone example that reproduces this error (including specific data?) so that we can further investigate? Cheers, Mike Fabrice Silva wrote: > Hello, > > I want to plot data containing nan values, but it seems that matplotlib > forget some non-nan values near nan values. > In the attached image, I plotted in blue the array for increasing of > x-data, and in red for decreasing x-data : > > import numpy as NX > > In [1]: from pylab import figure, plot, show > In [2]: figure(2) > Out[2]: <matplotlib.figure.Figure instance at 0x8445c8c> > > In [3]: type(Freq) > Out[3]: <type 'numpy.ndarray'> > > In [4]: NX.any(NX.isnan(Freq)) > Out[4]: True > > In [5]: type(Grillefr) > Out[5]: <type 'numpy.ndarray'> > > In [6]: NX.any(NX.isnan(Grillefr)) > Out[6]: False > > In [7]: plot(Grillefr, Freq, 'b', lw=2.) > Out[7]: [<matplotlib.lines.Line2D instance at 0x9245e8c>] > > In [8]: plot(Grillefr[::-1], Freq[::-1], 'r', lw=0.5) > Out[8]: [<matplotlib.lines.Line2D instance at 0x9245fec>] > > In [9]: show() > > with Grillefr containing values from 100 to 2000. > In the matplotlibrc, I have : > maskedarray : True > > Can anybody explain me why some points are not drawn by matplotlib ? > > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > ------------------------------------------------------------------------ > > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
