I'm using the {lattice} "levelplot" function to make a (more or less) 2-d
histogram, and for the most part it's working fine with my data. However, I
can't get the color key to do what I need. I can give it labels and custom
cutoffs, but my cutoff lines (and hence my labels) aren't evenly spaced,
instead
they're more-or-less logarithmic, starting at [0,20,50,100...] and continuing
on
up to 5 million.
Levelplot scales the ticks/labels linearly on the color key, leaving most my
labels scrunched down atop each other at the bottom and only the last few
(..."500K","1M","2M","5M") really visible on the rest of the key. I want each
gap (no matter its numerical range) to occupy one evenly-spaced "block" on the
color key, so they're all readable by the user. I want it to display value on
a
logarithmic scale (0,1,10,100,1000,...). The colorkey only seems to support
linear scales (0,2,4,6,8,10,...), at least by default, and I don't see any
options in the help to change that default.
Does levelplot support this? Or am I destined to draw the colorkey manually
(very painfully using polygon calls and user coordinates)? Or are there other
levelplot-like functions that would facilitate this? Any help is appreciated,
- Mike
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