assign a list using expression?
This still isn't clear. In your post, values is already
a list with the required names and values in it so the
whole exercise is pointless -- you are starting
out with the answer.
Just guessing, but maybe your setup is a set of variables
in your workspace and a vector of their names with the
output being a named list of them:
a <- 1:2; b <- 1:3
nms <- c("a", "b")
sapply(nms, get, simplify = FALSE)
On Mon, Jan 12, 2009 at 10:58 AM, Skotara <nils.skotara at uni-hamburg.de> wrote:
Thank you Patrick and Gabor! Sorry, I think I have not explainend it well. The purpose is as follows: names <- letters[1:3] values <- data.frame(a = 1:3, b = 4:6, c = 7:9) With more complicated objects similar to 'names' and 'values' I wrote the following line to assign the elements of the list: mycommand <- parse(text = paste(names, " = values[\"", names, "\"]", sep="") ) However, list(eval(mycommand)) does not do what I want. whereas list(a = values["a"], b = values["b"], c = values["c"]) does. I can not tell why... I try to understand, what expression and eval do. I know that many times there are other ways to achieve the same goal. So here, too. But I think there should be a reason why it does not work that way. Best regards! Nils