Or
dd[,myname]
should work too.
If you are worried about getting multiple columns, you can just make myname a
vector of column names using c() before you use either Jim's list indexing or
the above matrix indexing syntax.
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Sent from my phone. Please excuse my brevity.
Jim Holtman <jholt...@gmail.com> wrote:
dd[[ myname]] Sent from my iPad On May 21, 2011, at 7:37, Lars Bishop
<lars...@gmail.com> wrote: > Let's say I have the data frame 'dd' below. I'd
like to select one > column from this data frame (say 'a') and keep its name in
the > resulting data frame. That can be done as in #2. However, what if I >
want to make my selection based on a vector of names (and again keep > those
names in the resulting data frame). My attempt is #4 but doesn't > work. > > dd
<- data.frame(a = gl(3,4), b = gl(4,1,12), c=rnorm(12)) #1 > data.frame("a" =
dd[,"a"]) #2 > > mynames <- "a" #3 > data.frame(eval(mynames) = dd[, mynames])
#4 > > thanks, > Lars. > >_____________________________________________
> 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._____________________________________________
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.
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