Re: [R] Binary Matrices

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Thu 14 Apr 2005 - 00:02:12 EST

Mark Edmondson-Jones wrote:

> 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.

No. In principle you could use logicals, but that does not help for further calculations in eigen().

Uwe Ligges

> Thanks in advance for any help.
>
> Regards,
> Mark
>
>
> This message has been checked for viruses but the contents of an attachment
> may still contain software viruses, which could damage your computer system:
> you are advised to perform your own checks. Email communications with the
> University of Nottingham may be monitored as permitted by UK legislation.
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Thu Apr 14 00:11:32 2005

This archive was generated by hypermail 2.1.8 : Fri 03 Mar 2006 - 03:31:07 EST