I'm plotting upper and lower limits via the lolims and uplims keywords to
the errorbar function and have noticed two problems.
First, the direction of the arrows produced by these keywords are opposite
to one would expect, i.e. lolims=True should produce an upward-pointing
arrow and uplims should produce a downward-pointing arrow. For example, a
"lower-limit" means the exact value is unknown, but it is known not to be
below a particular value -- this is denoted by an upward arrow whose
starting point (arrow base) is at the value of the lower limit. The xlolims
and yuplims have this similar reversed behavior.
The second point deals with the starting point of the arrow base. For
limits, the arrow should begin at the value of upper/lower limit. Currently
the arrows are centered at the limit value.
To summarize both issues with an example:
errorbar(10, 10, yerr=1, uplims=True) should produce a downward pointing
arrow whose base is at (10, 10) and whose head is at (10, 9). It currently
produces an upward-pointing arrow whose base is at (10,9) and whose head is
at (10, 11).
Thanks,
Larry
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