Try this:

 lst[colSums(mapply('%in%', list(set), lst)) == 2]

On Wed, Jun 23, 2010 at 10:35 AM, Yuan Jian <jayuan2008@yahoo.com> wrote:

> Hi,
>
> it seems a simple problem, but I can not find a clear way.
> I have a list:
> lst=list(m=c('a','b','c'),n=c('c','a'),l=c('a','bc'))
> > lst
> $m
> [1] "a" "b" "c"
> $n
> [1] "c" "a"
> $l
> [1] "a"  "bc"
>
> how can I get list elements that include a given subset? for example, for
> given subset {'a','c'}, the answer should be 'm' and 'n'.
>
> thanks
> Yu
>
>
>
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>
>
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>
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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