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2001 Jul 10
1
color NA is allowed, but "NA" is not ... (yet)
In several places, we have the convention that col = NA means
`` don't draw '', e.g. for points() or rect().
For col = <vector> this only works when the vector is integer (numeric),
but not in other cases. I think this is a bug, even though not in the
strict sense, since we don't seem to claim it should work..
Example:
plot(1:10, col = c(1:4,NA,NA,4:1))
## fine