Sort a data frame with respect to more than one variable

if you need nested sorting then you can still use order(), e.g., in a 
longitudinal setting you may want to sort your data.frame with respect 
to subject's id and time within subject then use,

df[order(df$id, df$time), ]

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.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Marc Bernard" <bernarduse1 at yahoo.fr>
To: <r-help at stat.math.ethz.ch>
Sent: Wednesday, September 21, 2005 10:54 AM
Subject: [R] Sort a data frame with respect to more than one variable

Dear All,

How can I sort a data frame with respect to more than one  variable?

I know that for one variable X  one may use:   df[order(df$X), ] 
where df is  the data frame containing X.

Many thanks,

Bernard




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