R help - Oct 2005 - change factor labels

it must be terribly simple, can someone quickly help me?

test <- data.frame(y=c(1:10),
x=as.factor(c(rep("a",5),rep("b",5))))

how can i change the factor labels from "a" and "b" to for
example "u"  and
"v"?

i don't succeed with factor()

thanks a lot

------------------------------------------------
Sebastian Leuzinger
Institute of Botany, University of Basel

one way is to use:

levels(test$x) <- c("u", "v")


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


----- Original Message ----- 
From: "Sebastian Leuzinger" <Sebastian.Leuzinger at unibas.ch>
To: <r-help at stat.math.ethz.ch>
Sent: Tuesday, October 18, 2005 12:19 PM
Subject: [R] change factor labels

> it must be terribly simple, can someone quickly help me?
>
> test <- data.frame(y=c(1:10),
x=as.factor(c(rep("a",5),rep("b",5))))
>
> how can i change the factor labels from "a" and "b" to
for example
> "u"  and
> "v"?
>
> i don't succeed with factor()
>
> thanks a lot
>
> ------------------------------------------------
> Sebastian Leuzinger
> Institute of Botany, University of Basel
>
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