[R] list operation

[Phil Spector]

Yuan -
    There may be faster ways, but

names(lst)[sapply(lst,function(i)'a' %in% i && 'c' %in% i)]

seems to do what you want.
 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu



On Wed, 23 Jun 2010, Yuan Jian 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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