https://github.com/cran/pracma
Tip revision: 39aca747f500f69985711f7ae5e9969f93ecc860 authored by Hans W. Borchers on 21 June 2017, 07:52:27 UTC
version 2.0.7
version 2.0.7
Tip revision: 39aca74
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)
}