R help - Oct 2008 - How to get the duplicated elements from a vector?

Dear all,

     How can I get the duplicated elements from a vector? For example,
x <- c("yes", "no", "yes", "yes",
"no", "not sure"), how can I filter
out all the elements which occured >=2 times?

     Thanks for any help!

Regards,
Leon

Dear Leon,
Perhaps:

x <- c("yes", "no", "yes", "yes",
"no", "not sure")
names(table(x))[table(x)>=2]


HTH,


Jorge


On Wed, Oct 29, 2008 at 9:47 AM, Leon Yee <yee.leon@gmail.com> wrote:
> Dear all,
>
>    How can I get the duplicated elements from a vector? For example,
> x <- c("yes", "no", "yes",
"yes", "no", "not sure"), how can I filter out
> all the elements which occured >=2 times?
>
>    Thanks for any help!
>
> Regards,
> Leon
>
> ______________________________________________
> 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]]

check duplicated(), e.g.,

x <- c("yes", "no", "yes", "yes",
"no", "not sure")
x[duplicated(x)]


I hope it helps.

Best,
Dimitris


Leon Yee wrote:
> Dear all,
> 
>     How can I get the duplicated elements from a vector? For example,
> x <- c("yes", "no", "yes",
"yes", "no", "not sure"), how can I filter
> out all the elements which occured >=2 times?
> 
>     Thanks for any help!
> 
> Regards,
> Leon
> 
> ______________________________________________
> R-help at 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.
> 
-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014

On Wed, Oct 29, 2008 at 2:47 PM, Leon Yee <yee.leon at gmail.com>
wrote:
> Dear all,
>
>    How can I get the duplicated elements from a vector? For example,
> x <- c("yes", "no", "yes",
"yes", "no", "not sure"), how can I filter out
> all the elements which occured >=2 times?
>
>    Thanks for any help!
>
> Regards,
> Leon
>
Hi Leon,

unique(x)

or

duplicated(x)

should work, depending on what you want.

Best,

Gustaf

-- 
Gustaf Rydevik, M.Sci.
tel: +46(0)703 051 451
address:Essingetorget 40,112 66 Stockholm, SE
skype:gustaf_rydevik

Gustaf Rydevik wrote:
> Hi Leon,
> 
> unique(x)
> 
> or
> 
> duplicated(x)
> 
> should work, depending on what you want.
> 
> Best,
> 
> Gustaf
> 
Hi,
    Thank you all. Actually, I have a data frame or matrix, whose first 
column is numerical values, and whose 2nd column is names. I need those 
whose names repeated 3 times and get the mean of the 3 values for each 
repeated names.

    It sounds that I need some programming work.

Regards,
Leon