I did not look at the code, but I thought that the errors were automatically recomputed in log scale as delta_Y/Y/log(10) Johann
Michael Droettboom wrote: > 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 >> > ------------------------------------------------------------------------------ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
