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}}
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$group,
function (x) seq(1, len = length(x))))
reshape(d, idvar = "group", direction = "wide")
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
----- Original Message -----
From: "Shubha Vishwanath Karanth" <shubhak at ambaresearch.com>
To: <r-help at stat.math.ethz.ch>
Sent: Thursday, February 14, 2008 3:22 PM
Subject: [R] Transposing by a group variable
> Hi R,
>
>
>
> Can I transpose a data frame by a particular group variable?
>
>
>
> For example:
>
> d=data.frame(group=c(1,1,2,2,2),val=c(6,4,6,3,5))
>
> And my output should be:
>
> data.frame(group=c(1,2),v1=c(6,6),v2=c(4,3),v3=c(NA,5))
>
>
>
> Many thanks,
>
> Shubha
>
> This e-mail may contain confidential and/or privileged
> i...{{dropped:13}}
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
Try also: reshape(cbind(d, time=unlist(sapply(table(d$group), seq))), idvar="group", direction="wide") On 14/02/2008, Shubha Vishwanath Karanth <shubhak at ambaresearch.com> wrote:> 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}} > > ______________________________________________ > R-help at r-project.org mailing list > 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. >-- Henrique Dallazuanna Curitiba-Paran?-Brasil 25? 25' 40" S 49? 16' 22" O
How do we know what value corresponds to what new variable? library(reshape) mm <- melt(d, id="group") cast(mm, group~value) will give you something but not quite what you want. --- Shubha Vishwanath Karanth <shubhak at ambaresearch.com> wrote:> 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}} > > ______________________________________________ > R-help at r-project.org mailing list > 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. >