On 06.04.2010 23:28, David.Epstein wrote:
How do I append an R-object to a list?
I want to start with an empty list, and append R-objects one by one.
Does this start with a command like
mylist<- NULL
??
I have read a few answers on R-help to questions like this, but they all
seem to be well off the point. Sometimes it's assumed that the list is a
vector---not my case.
One answer I read said that the object appended must be a list. This doesn't
make sense to me. I don't want a list of lists. I want a list of R-objects.
I tried using c(with.stuff.inside.the.brackets). This seemed to unwrap my
structures, storing the individual components rather than the R-objects
themselves.
I tried looking in "Intro to R" but could find nothing relevant.
Thanks for any help.
David
Well lists are vectors of mode list.
If you have a list L and want to append an element l, you can simply add
it by:
c(L, list(l))
One element of a List L extracted by vector indexing (single brackets):
L[1]
will show you got a list of length one back (since L is a vector of mode
list).
You may want to play around and find that things are even simpler than
you thought they are.
Uwe Ligges
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