Hi Sean,
Try :
key(test.dt) = c("a","b")
Btw, the posting guide asks you to contact the maintainer of the package
before r-help. Otherwise r-help would fill up with posts about 2000+
packages (I guess is the reason). In this case maintainer("data.table")
returns "[email protected]" (cc'd) where you will
be very welcome.
Matthew
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