[R] Binary Matrices

From: Mark Edmondson-Jones <Mark.Edmondson-jones_at_nottingham.ac.uk>
Date: Wed 13 Apr 2005 - 23:50:43 EST


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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