Re: [R] Binary Matrices

From: Uwe Ligges <>
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
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