Hi,
I think I have a problem with errorbars in a log plot. The problem is
reproducible through the enclosed errorbar_log.py file. As you can see I
plot a point with y = 10**(-5) and I want the errorbars drawn from
10**(-5.5) to 10**(-4.5) which should be symmetric in this plot but isn't.
Here is the content of my errorbar_log.py file:
#!/usr/bin/python
import numpy as np
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_subplot(111)
x = 0.0
y = 10**(-5.0)
yerr_low = 10**(-5.5)
yerr_upp = 10**(-4.5)
ax.errorbar(x,y,yerr=[[yerr_low],[yerr_upp]],fmt='o',markersize=4)
ax.set_xlim(-1.0,1.0)
ax.set_ylim(1E-6,1E-3)
ax.set_yscale('log')
plt.savefig('errorbar.png')
---------------------------------------------
10**(-5.5) = 3.162277660168379e-06
and 10**(-4.5) = 3.1622776601683795e-05
but you can see that the lower boundary is not at the calculated value.
<http://matplotlib.1069221.n5.nabble.com/file/n40412/errorbar.png>
Do I misunderstand the behaviour of the errorbar function or is this a bug?
Cheers,
Markus
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