I was mistaken. There were duplicates in my y vector. Please ignore my
previous message. Sorry.
-----Original Message-----
From: Downey, Patrick
Sent: Thu 6/30/2011 11:08 PM
To: r-help@r-project.org
Subject: merge function
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
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
