[R] extracting elements from a list in vectorized form

[jgarcia at ija.csic.es]

Hi;
It seems to me that has probably been asked in the past. But I cannot find
the track.

I usually need to extract elements from a list and contruct vector from
them; e.g., to create a table. Perhaps there is a way to directly extract
them without looping?
Simple example:

> S.lst
$sublist.1
$sublist.1$age
[1] 24.58719

$sublist.1$weight
[1] 60.82861


$sublist.2
$sublist.2$age
[1] 32.39551

$sublist.2$weight
[1] 59.46347

etc.

I would like to extract, e.g.,  directly all weights element from each
sublist without looping. I  know it is possible to do this as:

unlist(S.lst)[paste("sublist.",1:length(S.lst),".weight",sep="")]

but there is not some short-cut? something like

S.lst[[1:length(S.lst)]]$weight ?


Thanks and B.regards

Javier
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