I have to say I don't really have a lot of experience with error bars on log plots -- but the root cause here is that the lower bound of the error bar goes negative, and as we all know, the log of a negative number is undefined. If you can suggest where the lower bound should be drawn or provide third-party examples, I'm happy to look into this further and resolve this "surprise".
Mike Cohen-Tanugi Johann wrote: > yes exactly.... > I should have provided a test case, thanks for following up! > Johann > > Matthias Michler wrote: > >> Hello Johann, >> >> is the problem you are reporting the one I observe in the attached picture? >> Namely some vertical and horizontal lines are missing when using >> yscale="log". More precisely everything below y=1 seems to be missing. >> >> The picture was generated with the code below and >> matplotlib.__version__ = '0.98.6svn' >> matplotlib.__revision__ = '$Revision: 6887 $' >> >> best regards Matthias >> >> ############################### >> import numpy as np >> import matplotlib.pyplot as plt >> >> plt.subplot(111, xscale="log", yscale="log") >> x = 10.0**np.linspace(0.0, 2.0, 20) >> y = x**2.0 >> plt.errorbar(x, y, xerr=0.1*x, yerr=5.0+0.75*y) >> plt.show() >> ################################ >> On Friday 27 March 2009 16:12:12 Cohen-Tanugi Johann wrote: >> >> >>> Hello, what is the best way to get log log plots with error bars? I >>> tried putting log10() everywhere but as I was afraid results look ugly.... >>> thanks, >>> johann >>> >>> >>> ------------------------------------------------------------------------ >>> >>> ------------------------------------------------------------------------ >>> >>> ------------------------------------------------------------------------------ >>> >>> ------------------------------------------------------------------------ >>> >>> _______________________________________________ >>> Matplotlib-users mailing list >>> Matplotlib-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users >>> >>> > > ------------------------------------------------------------------------------ > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > -- Michael Droettboom Science Software Branch Operations and Engineering Division Space Telescope Science Institute Operated by AURA for NASA ------------------------------------------------------------------------------ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
