[EMAIL PROTECTED] wrote:
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 ?
I think this should do it:
sapply(S.lst, "[[", "weight")
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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