Are you looking for:
dd[, "a", drop=FALSE]
On 21/05/2011 12:37, Lars Bishop 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.
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
