[R] output from table() in matrix form

[Dimitris Rizopoulos]

Hi Robin,

does this help:

x <- table(c(1,1,1,1,2,20))
matrix(c(as.numeric(names(x)), x), ncol=length(x), byrow=TRUE, 
dimnames=NULL)

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat
     http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Robin Hankin" <r.hankin at soc.soton.ac.uk>
To: <R-help at stat.math.ethz.ch>
Sent: Wednesday, January 05, 2005 1:18 PM
Subject: [R] output from table() in matrix form


> Hi
>
> How do I get the output from table() in matrix form?
>
> If I have
>
> R>  table(c(1,1,1,1,2,20))
>
>  1  2 20
>  4  1  1
>
> I want
>
>      [,1] [,2] [,3]
> [1,]    1    2   20
> [2,]    4    1    1
>
>
> The problem is that names(table) is a vector of characters and I 
> need the numeric values.
>
> I am using
>
> R>  rbind(as.integer(names(x)),x)
>
>
>
>
> I thought tabulate() might be better as it takes an integer-valued 
> vector, but it isn't
> quite right because the default bins are 1:20 and  I don't want the 
> zeroes.
>
> The following is a little clunky:
>
> R> x <- rbind(1:20,tabulate(c(1,1,1,1,2,20)))
> R> x[,x[2,]>0]
>      [,1] [,2] [,3]
> [1,]    1    2   20
> [2,]    4    1    1
>
>
> Is there a better way?   It seems inelegant to coerce a character 
> vector back to integers,
> but OTOH  it's wasteful to have 20 bins when I only need 3.  My real 
> application would have
> maybe a dozen distinct (prime) integers in the range 2 up to about 
> 1e4.
>
>
>
>
>
> --
> Robin Hankin
> Uncertainty Analyst
> Southampton Oceanography Centre
> European Way, Southampton SO14 3ZH, UK
>  tel  023-8059-7743
>
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