Re: [R] Transposing by a group variable

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.be>
Date: Thu, 14 Feb 2008 15:43:43 +0100

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


> 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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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu 14 Feb 2008 - 14:54:49 GMT

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