I have the error from a table which is in log units, and the error is given to be symmetric in log space.
Cheers, Markus On 2015-04-07 16:40, Yuxiang Wang wrote: > Typo - "standard deviation OR standard error of mean", not "OF". > > Sorry. > > Shawn > > > On Tue, Apr 7, 2015 at 10:39 AM, Yuxiang Wang <yw...@virginia.edu> wrote: >> If you error bars denote standard deviation of standard error of mean, >> shouldn't they be non-symmetric in log scale? >> >> Shawn >> >> On Tue, Apr 7, 2015 at 10:11 AM, Markus Haider <markus.hai...@uibk.ac.at> >> wrote: >>> Hi, >>> >>> I am trying to make an errorbar plot with a logarithmic x-axis. I have >>> symmetric errors in logspace, however if I plot them, the errors are not >>> symmetric anymore, as you can see in the enclosed image. Am I >>> misunderstanding something or is this a bug? >>> >>> Thanks for your help, >>> Markus >>> >>> Here the code I used to produce the plot: >>> >>> import matplotlib.pyplot as plt >>> >>> import numpy as np >>> >>> data_x_log = np.array([13.0,15.0]) >>> >>> data_y = np.array([0.5,1]) >>> >>> error_x_log = np.array([0.5,1.]) >>> >>> error_x_lower = 10**(data_x_log-error_x_log) >>> >>> error_x_upper = 10**(data_x_log+error_x_log) >>> >>> fig = plt.figure() >>> >>> ax = fig.add_subplot(111) >>> >>> ax.errorbar(10**data_x_log,data_y,xerr=[error_x_lower,error_x_upper],ls='',marker='o') >>> >>> ax.set_xscale('log') >>> >>> ax.set_xlim([1E11,1E17]) >>> >>> ax.set_ylim([0,2]) >>> >>> plt.savefig('error.png') >>> >>> >>> ------------------------------------------------------------------------------ >>> BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT >>> Develop your own process in accordance with the BPMN 2 standard >>> Learn Process modeling best practices with Bonita BPM through live exercises >>> http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ >>> source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF >>> _______________________________________________ >>> Matplotlib-users mailing list >>> Matplotlib-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users >>> >> >> >> -- >> Yuxiang "Shawn" Wang >> Gerling Research Lab >> University of Virginia >> yw...@virginia.edu >> +1 (434) 284-0836 >> https://sites.google.com/a/virginia.edu/yw5aj/ > > ------------------------------------------------------------------------------ BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users