try this:
d <- data.frame(group = c(1,1,2,2,2), val = c(6,4,6,3,5))
d$time <- unlist(tapply(d$group, d$group,
function (x) seq(1, len = length(x))))
reshape(d, idvar = "group", direction = "wide")
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: "Shubha Vishwanath Karanth" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, February 14, 2008 3:22 PM
Subject: [R] Transposing by a group variable
> Hi R,
>
>
>
> Can I transpose a data frame by a particular group variable?
>
>
>
> For example:
>
> d=data.frame(group=c(1,1,2,2,2),val=c(6,4,6,3,5))
>
> And my output should be:
>
> data.frame(group=c(1,2),v1=c(6,6),v2=c(4,3),v3=c(NA,5))
>
>
>
> Many thanks,
>
> Shubha
>
> This e-mail may contain confidential and/or privileged
> i...{{dropped:13}}
>
> ______________________________________________
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>
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