passing a vector of variable names to the ... pairlist function argument
On 21.04.2011 16:03, Jessica Myers wrote:
Hi,
I have a character vector that contains the names of several objects
that I would like to pass to a function (specifically, the ridge
function in the survival package, but cbind is a similar example). I've
been struggling with how to do this so that the object values get
interpreted by the function, rather than the object names.
For example,
x1 <- 1:4
x2 <- 2:5
x3 <- 3:6
xs <- c("x1", "x2", "x3")
If I wanted to cbind(x1, x2, x3) without typing this out, how would I do
it?
For the cbind case, I'd omit cbind and ask R to:
sapply(xs, get)
or
apply(matrix(xs), 1, get)
or with cbind():
do.call("cbind", lapply(xs, get))
the latter can be generalized for other function calls, of course.
Best,
Uwe Ligges
Thanks very much!
Jessica Myers
Instructor in Medicine
Division of Pharmacoepidemiology
Brigham and Women's Hospital
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