Information lost while adding a list into a list

Question

I am trying the following code, with R 2.13:

aa <- list()
aa["test"] <- list(x1=5,x2=7)

What I get is:

> aa
$test
[1] 5

but I would like something closer to:

$test
 $x1 5
 $x2 7

Can someone explain me what I am doing wrong? Thanks!

Answer 1

OK, just found what I was doing wrong!

aa[["test"]] <- list(x1=5,x2=7)

Does the trick!