Hi all,
If I try to plot a graph with some y-values as -inf (which is very
common in physical sciences as we often take log10 of amplitude values
which can be zero), then matplotlib raises an exception:
/usr/lib/python2.5/site-packages/matplotlib/ticker.py in
scale_range(vmin, vmax, n, threshold)
814 offset = 10**ex
815 else:
--> 816 ex = divmod(math.log10(-meanv), 1)[0]
817 offset = -10**ex
818 ex = divmod(math.log10(dv/n), 1)[0]
<type 'exceptions.OverflowError'>: math range error
It is clear where the problem is, matplotlib takes log10 of the mean
y-range (in this case infinity) to auto scale the y-axis.
I know I can modify my input values to get around this problem, but it
is so common to want to plot data (some of which may be zero) in say a
decibel scale, that having a workaround for the case of -inf input
would be nice. I tried to look into writing one myself, but got
quickly lost. If someone could point me at the files/functions I
should look at I will have a go.
Hope somebody can help!
Best regards,
John Travers
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