Re: [R] selections of data by one variable

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.ac.be>
Date: Wed 04 May 2005 - 23:00:32 EST

try this:

d <- data.frame(a=1:10, b=11:20)
e <- c(13, 15, 17)
##############
d. <- subset(d, b %in% e)
d.

I hope it helps.

Best,
Dimitris



Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium

Tel: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat/
     http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm



> Dear R experts,
>
> My problem is as follows:
>
> Suppose I have a data frame d comprising two variable a<-c(1:10) &
> b<-c(11:20).
>
> I now want to select a subgroup according the values of b.
>
> I know if I just want to select, say, b=17, I can use f<-d[d$b==17]
> and R will give me
>> f
> a b
> 7 7 17
>
> However, if now I want to select a subgroup according to
> b==e<-c(13,15,17), then the same syntx doesn't work.

>
> What is the correct way to do it? My data have more than one
> million subjects, and I want to select part of them according to
> their id numbers.
>
> Your help will be highly appreciated.
>
> Best regards,
>
> Yu-Kang
>
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>



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed May 04 23:40:47 2005

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