R help - Aug 2001 - subset for list

Hi all!
Suppose we have this list:
x<-list("101"=list(t=c(1,3,4),n=3),"104"=list(t=c(1,2),n=2),"110"=list(t=c(5,6,3,4),n=4))

(For example, 101, 104, 110 are ID number of subject, t and n are 
measurements belong to each subject)

We can take subset of that list by, for instance,
x$"101"

But how do we select multiple subject? Is there any subset-like function 
for a list?

Thanks,
Danar.

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Danardono wrote:
> 
> Hi all!
> Suppose we have this list:
>
x<-list("101"=list(t=c(1,3,4),n=3),"104"=list(t=c(1,2),n=2),"110"=list(t=c(5,6,3,4),n=4))
> 
> (For example, 101, 104, 110 are ID number of subject, t and n are
> measurements belong to each subject)
> 
> We can take subset of that list by, for instance,
> x$"101"
> 
> But how do we select multiple subject? Is there any subset-like function
> for a list?
I dunno,

but the following should do the job:
> mysubset <- c("101","104")
> x[match(mysubset,names(x))]



I hope it helps...




Laurent






-- 
Laurent Gautier			CBS, Building 208, DTU
PhD. Student			D-2800 Lyngby,Denmark	
tel: +45 45 25 24 85		http://www.cbs.dtu.dk/laurent
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