Hi,
I think droplevels(df) is what you are looking for.
Best wishes,
Ulrik
On Tue, 1 Mar 2016 at 17:33 hoda rahmati via R-help <r-help@r-project.org>
wrote:
> Hi all,I have the following main data frame:(mydata) $ TE : num 40
> 40 20 20 20 20 20 20 20 40 ... $ TR : num 49 49 28 28 28 28 28 28 28
> 49 ... $ COUNTRY : Factor w/ 27 levels "","AU","BA","BE",..: 8 8 8 8
> 8 ...among the COUNTRY I just need US and AU,first I get a subset to
> contain just these two countries:
> submydata=subset(mydata,COUNTRY%in%c("US","AU"))
> factor(submydata$COUNTRY) but after this when I get str of mydata again I
> have the same data frame with no changes in COUNTRY, however I want mydata
> to be like:
> $ TE : num 40 40 20 20 20 20 20 20 20 40 ... $ TR : num 49
> 49 28 28 28 28 28 28 28 49 ... $ COUNTRY : Factor w/ 2 levels
> "","AU","US",..: 8 8 8 8 8 8 8 8 8 8Thanks for any help
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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]]
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.
