[R] fill Matrix quicker

[monk]

dear all,

i have a quite simple question, i want to fill up a Matrix like done in the
following function,
but the performance is very bad for large dimensions
is there a way to do this like with apply or something similar?


makeMatrix <- function(a, b,dim) {
	X=matrix(0,ncol=dim,nrow=dim)



	for (i in c(1:dim)){
		for (j in c(1:dim)) {
		if (i==j) {X[i,j]<-a}
		else { X[i,j]<-  exp(( -1*abs(i-j))/(3*b)) }
		}
	}
	X
}

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