Qs on "vector of lists", etc.

I'm pretty new to R, so please forgive the cluelessness of these questions.

Is it true that it is not possible to have a "vector or lists" in R?

Is a "list of lists" the closest one can get to a "vector of lists"?

Actually a list is a vector of mode "list".

Hence if you have a list of lists, it *is* a vector of lists and behaves 
consistantly (e.g. when subsetiing with [] rather than [[]]).

L <- list(list(a=1, b=2), list(c=3, d=4))

L[1] # L can be considered a vector of mode list.

Is it possible to have a "matrix of lists" in R?  Or an "array of lists"?

Yes:

  X <- matrix(L, nrow=2)
  X[1,1]
  X[2,1]

or even:

  dim(X) <- c(1,2,1)
  mode(X)  # "list"
  class(X) # "array"

Uwe Ligges

Thanks!

Roy

	[[alternative HTML version deleted]]

______________________________________________
R-help at 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.