R help - May 2010 - intersect

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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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
>
>
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
	[[alternative HTML version deleted]]

<jayuan2008 at yahoo.com> wrote:
> 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")
a %in% b
[1] FALSE  TRUE FALSE  TRUE

On 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]
The other answers probably gave you what you wanted, but you should  
not leave this exchange thinking that True == TRUE or that False  
=FALSE in R.

-- 

David Winsemius, MD
West Hartford, CT