[R] ordering a data frame to same order as a chr vector

Dimitris Rizopoulos dimitris.rizopoulos at med.kuleuven.be
Mon Jan 23 17:13:57 CET 2006

probably you are looking for something like the following:

dat <- data.frame(chr = letters[1:20], x = rnorm(20), y = rnorm(20))
chr.vec <- sample(letters[1:20])
dat[match(chr.vec, dat$chr), ]

I hope it helps.


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://www.med.kuleuven.be/biostat/

----- Original Message ----- 
From: "Ken Termiso" <jerk_alert at hotmail.com>
To: <r-help at stat.math.ethz.ch>
Sent: Monday, January 23, 2006 4:55 PM
Subject: [R] ordering a data frame to same order as a chr vector

> Hi all,
> I've got a data frame that has an identical column to a chr vector. 
> I would
> like to use the chr vector to order the rows of the data frame to be
> identical to the order in the chr vector (the contents of the chr 
> vector are
> completely identical to one col of the data frame), but this is 
> proving
> trickier than it sounds..
> Any help would be much obliged,
> -Ken
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