[R] Binary Matrices

[Dimitris Rizopoulos]

you mean something like this:

matrix(sample(0:1, n*n, TRUE), n, n)


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: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat/
     http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Mark Edmondson-Jones" <Mark.Edmondson-jones at nottingham.ac.uk>
To: <r-help at stat.math.ethz.ch>
Sent: Wednesday, April 13, 2005 3:50 PM
Subject: [R] Binary Matrices


> I'm wanting to perform analysis (e.g. using eigen()) of binary 
> matrices - i.e. matrices comprising 0s and 1s.
>
> For example:
>
> n<-1000
> test.mat<-matrix(round(runif(n^2)),n,n)
> eigen(test.mat,only.values=T)
>
> Is there a more efficient way of setting up test.mat, as each cell 
> only requires a binary digit?  I imagine R is setting up a structure 
> which could contain n^2 floats.
>
> Thanks in advance for any help.
>
> Regards,
> Mark
>
>
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