[R] How do I write a sum of matrixes??

[Alberto Monteiro]

> 3) Bill Venables offered this about a week ago in this list:
> --------------
> This is probably as good a way as any way for this kind of problem.
> First define a binary operator:
> 
> > "%^%" <- function(x, n)
>         with(eigen(x), vectors %*% (values^n * t(vectors)))
> 
This example only works for _diagonalizable_ matrices. It
crashes, for example, in cases like:

m <-  rbind(c(1,1,0), c(0,1,1), c(0,0,1))
m %^% 2
m %*% m

Alberto Monteiro