[R] subset data.frame with constraint of many values?

[Dimitris Rizopoulos]

try this:

dt[dt$a %in% 2:4, ]


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/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Dong-hyun Oh" <r.arecibo at gmail.com>
To: "R-help" <r-help at stat.math.ethz.ch>
Sent: Wednesday, October 24, 2007 11:44 AM
Subject: [R] subset data.frame with constraint of many values?


> Dear UseRs,
>
> Let us assume that I have data.frame named as dt.
>
> dt is as follows:
>
> a    b    c    d
> 1    3    4    5
> 2    3    3    2
> 1    3    4    2
> 3    2    4    5
> 4    5    3    6
> 3    2    5    7
> 2    5    7    8
> .....................
> .....................
>
> I want to subset dt with fileds a having 2 or 3 or 4, and I wrote
> following code.
>
> dt[dt$a == 2 | dt$a == 3 | dt$a == 4,]
>
> Is there more efficient way for subset?
>
> Thanks in advance.
>
> ______________________________________________
> 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.
> 


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