__________________________________________________
[ ]
[ Giovanni Petris GPetris at uark.edu ]
[ Department of Mathematical Sciences ]
[ University of Arkansas - Fayetteville, AR 72701 ]
[ Ph: (479) 575-6324, 575-8630 (fax) ]
[ http://definetti.uark.edu/~gpetris/ ]
[__________________________________________________]
> Date: Tue, 20 Jan 2004 16:40:07 +0000
> From: Federico Calboli <f.calboli at ucl.ac.uk>
> Sender: r-help-bounces at stat.math.ethz.ch
> Organization:
> Precedence: list
>
> Dear All,
>
> I would like to ask why the zeroeth power of a matrix gives me a matrix
> of ones rather than the identity matrix:
>
> > D<-rbind(c(0,0,0),c(0,0,0),c(0,0,0))
> > D<-as.matrix(D)
> > D
> [,1] [,2] [,3]
> [1,] 0 0 0
> [2,] 0 0 0
> [3,] 0 0 0
>
> > D^0
> [,1] [,2] [,3]
> [1,] 1 1 1
> [2,] 1 1 1
> [3,] 1 1 1
>
> I would have expected the identity matrix here.
>
> I find the same result with every other square matrix I used.
> BTW, I am using R 1.8.1 on Linux Mandrake 9.1
>
> Cheers,
>
> Federico Calboli
> --
>
>
>
> =================================
>
> Federico C. F. Calboli
>
> PLEASE NOTE NEW ADDRESS
>
> Dipartimento di Biologia
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> 40126 Bologna
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>
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> fax (+39) 051 251 208
>
> f.calboli at ucl.ac.uk
>
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