swh:1:snp:81eadaa089e8253d8469bcef66aa332632c6c669
Tip revision: fdf16693b000f3e309c56091892c61f0ec9fd670 authored by Hans W. Borchers on 21 November 2017, 16:15:00 UTC
version 2.1.1
version 2.1.1
Tip revision: fdf1669
roots.R
###
### ROOTS.R Matlab ROOTS Function
###
roots <- function(p) {
if (is.null(p) || length(p) == 0) return(matrix(0, nrow=0, ncol=0))
if ( !is.vector(p, mode="numeric"))
stop("Argument p must be a vector of real numbers.")
if (length(p) == 1) return(matrix(0, nrow=0, ncol=0))
# Find non-zero entries in p
inz <- which(p != 0)
nnz <- length(inz)
if (nnz == 0) return(c())
# Strip leading and trailing zeros, but remember the trailing zeros
q <- p[inz[1]:inz[nnz]]
r <- rep(0, length(p) - inz[nnz])
A <- compan(q)
return(c(r, eig(A)))
}