https://github.com/cran/pracma
Tip revision: bf076735a09836a6103775a9d4efaf8f0ecad928 authored by Hans W. Borchers on 02 December 2018, 07:00:03 UTC
version 2.2.2
version 2.2.2
Tip revision: bf07673
wilkinson.R
##
## w i l k i n s o n . R Wilkinson matrix
##
wilkinson <- function(n){
if (length(n) != 1 || n != round(n))
stop("Argument 'n' must be an integer.")
if (n <= 0) return(c())
m <- (n-1)/2.0
r <- rep(1, n-1)
Diag(abs(-m:m)) + Diag(r, 1) + Diag(r, -1)
}