Hi Yuan,

Try

> a<-c("aa", "bb", "ff", "cc")
> b <-c("oo","jj","bb","cc")
> a %in% b
[1] FALSE  TRUE FALSE  TRUE

HTH,
Jorge


On Tue, May 11, 2010 at 10:31 PM, Yuan Jian <> wrote:

> Hi there,
>
> how can I test every element in a vector whether appears in another vector?
> such as
> a<-c("aa", "bb", "ff", "cc")
> b <-c("oo","jj","bb","cc")
>
> somefunction(a,b) gives [False, True, False, True]
>
> thanks
> yuan jian
>
>
>
>
>
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>
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