Cohen-Tanugi Johann wrote: > I tried to look at the code (axes.py I presume) in order to attempt a > patch, but it defeated me, I do not have the instructions to navigate > through this code :) > Where is the actual transform of the error bars occurring?
I think it is in the draw (or recache) method of the artists. The right way to handle this problem is not obvious to me. Maybe with a variant of the log scale that clips instead of masking invalid points. And maybe instead of making a whole set of such variants, the behavior--masking versus clipping, and the clip level if the latter--should be handled by an rcParam. Eric > thanks, > 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
