https://github.com/cran/pracma
Tip revision: 63f12837f2d7d6d30cdc2b2df60efdef228d8d0f authored by HwB on 10 May 2011, 00:00:00 UTC
version 0.4-0
version 0.4-0
Tip revision: 63f1283
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)
mdiag(abs(-m:m)) + mdiag(r, 1) + mdiag(r, -1)
}