Re: [R] select rows from data based on a vector of char strings

From: Chuck Cleland <ccleland_at_optonline.net>
Date: Wed, 23 Apr 2008 04:24:19 -0400

On 4/23/2008 3:13 AM, Dirkheld wrote:
> Hi,
>
> I have loaded a dataset in R :
> data =
>
> label freq1 freq2
> news 54 35
> fun 37 21
> milk 19 7
> food 3 3
> .... etc
>
> And I have a vector
> flist<-c("fun","food")
>
> Now I want to use the vector 'flist' for selecting these values from 'data'
> so that I get the following dataset :
> label freq1 freq2
> fun 37 21
> food 3 3
>
> When I do 'data$label==flist[1]' I get 'F T F F', so it works for one item
> in the char vector flist.
> But, when I do 'data$label==flist' I get 'F F F F' while I expected 'F T F
> T'. It seems that I can't perform this action with a vector of charstrings?
>
> Is there an other way to do so?

newdata <- subset(data, label %in% flist)

?subset
?is.element

-- 
Chuck Cleland, Ph.D.
NDRI, Inc. (www.ndri.org)
71 West 23rd Street, 8th floor
New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
tel: (732) 512-0171 (M, W, F)
fax: (917) 438-0894

______________________________________________
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.
Received on Wed 23 Apr 2008 - 08:27:13 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Wed 23 Apr 2008 - 08:30:30 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive