[R] Transposing by a group variable

[Dimitris Rizopoulos]

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" <shubhak at ambaresearch.com>
To: <r-help at stat.math.ethz.ch>
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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