Georg,

See errorbar_demo.py in the examples directory.  The last example sets 
the y-axis to a log scale; it should also work if you use the same 
method to set both scales to log, so it would be like this:

ax = subplot(111)
ax.set_xscale('log')
ax.set_yscale('log')
errorbar(t, s+2, e, f, fmt='o')

You may need to be careful to keep all values, including errorbar 
limits, positive.

Eric


Georg Holzmann wrote:
> Hallo!
> 
> Is there any possibility to use a logarithmic errorbar plot ?
> I want to draw my values as with loglog, but additionally add the 
> variance to the data points as with yerr in errorbar.
> 
> Or is it maybe better to add the variance manually in a loglog plot - is 
> this possible ?
> 
> Thanks for any hints,
> LG
> Georg
> 
> PS:
> I also found this unanswered post about the same topic: 
> http://www.nabble.com/semilogx-and-errorbar-tt5182429.html#a5182429
> 
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