https://github.com/cran/pracma
Tip revision: c69aa96969f2c9b1cbf8c3970f9dc394bfcbd550 authored by Hans W. Borchers on 07 December 2021, 05:30:02 UTC
version 2.3.6
version 2.3.6
Tip revision: c69aa96
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)
}