[R] Accessing named members of a list in an array

[mlell08]

Dear List,

I've created a two-dimensional array which shall contain a value and its
error, respectively.
These two values are concatenated in al list and bear the names "sl" and
"sl_err"

But I can't adress them using the $-notation.

a<- array(list(NULL),dim=c(2,2))
a[[1,1]]<- c(a=2,b=3)
a[[1,1]]$a
## Fehler in a[[1, 1]]$a : $ operator is invalid for atomic vectors
a[[1,1]]["a"]       # This works however.
## a
## 2

I always thought these two methods of indexing are equal? Is there any
way to use the $-Style indexing?

Thank you,
Moritz

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