Greg Minshall <minsh...@umich.edu> writes:
list(1,2,3)
[[1]]
[1] 1
[[2]]
[1] 2
[[3]]
[1] 3
c(1,2,3)
[1] 1 2 3
----
(where =c= is the "concatenation operator".)
so, to me, at least, "proper list" is not a well-defined term in
R.
cheers, Greg
=c= is "a generic function which combines its arguments" according
to the R documentation. It could do different things depending on
the input.
=list()= will create an actual R list which are "Generic Vectors"
according to the R documentation. Each element of a list can be
any other R data structure including other lists, expressions and
symbols.
"Proper list" in the context of this discussion and pertaining to
R would be a =list()=, not a vector which is what is usually
returned by =c()=. A =data.frame()= is a special case of a
=list()= where every column has to have the same length.
Johan
--
Johan Tolö
