Hello,
I'm clearly confused about the merge function. In the following
r <- merge(x,y,all.x=T,all.y=F)
my y vector has only unique values (no duplicates). So I don't understand
how this can ever generate an r which is of greater length than x.
I thought the default behavior was only matching rows are included, but
that using all.x=T included rows with unmatched x's as well. If all the y's
are unique, though, I don't understand how length(r) > length(x) is
possible.
Some clarification would be great.
Thanks,
Mitch
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