[R] reshaping data?
Dimitris Rizopoulos
dimitris.rizopoulos at med.kuleuven.be
Thu Sep 29 16:00:55 CEST 2005
you could use something like this (but maybe there are better
proposals):
dat <- data.frame(g = rep(letters[1:3], each = 5), val = runif(15))
out <- do.call(rbind, lapply(split(dat$val, dat$g), function(x){
f <- factor(findInterval(x, vec = seq(0, 1, 0.1)), levels = 1:10)
table(f)
}))
colnames(out) <- seq(0.1, 1, 0.1)
out
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: "Karin Lagesen" <karin.lagesen at medisin.uio.no>
To: <r-help at r-project.org>
Sent: Thursday, September 29, 2005 3:16 PM
Subject: [R] reshaping data?
>
> I have a file like this:
>
>
> a 0.1
> a 0.2
> a 0.9
> b 0.5
> b 0.9
> b 0.7
> c 0.6
> c 0.99
> c 0.88
>
> Which I would like to get to be the following matrix:
>
> 0.1 0.2 0.3 0.4 ...
> a 1 2 0 0
> b 0 0 0 0
> ..
>
> I.e: each place in the matrix denotes how many entries in each
> category that are betwee 0.0 and 0.1, 0.1 and 0.2 and so on.
>
> The way I was thinking of doing it was by constructing an empty
> matrix
> and then doing a for loop testing each element and incrementing in
> the
> matrix as appropriate. However, it struck me that this has to be
> easier to do than that. Am I right?
>
> Karin
> --
> Karin Lagesen, PhD student
> karin.lagesen at medisin.uio.no
> http://www.cmbn.no/rognes/
>
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