Revision 04bbc417cf2927b827660bc07743429783569aec authored by HwB on 10 February 2013, 00:00:00 UTC, committed by Gabor Csardi on 10 February 2013, 00:00:00 UTC
1 parent 0e3ae6b
compan.R
###
### COMPAN.R Polynom
###
compan <- function(p) {
if (length(p) == 0) return(c())
if ( !is.vector(p, mode="numeric"))
stop("Argument p must be a vector of real numbers.")
while(p[1] == 0 && length(p) >= 2) {
p <- p[2:length(p)]
}
n <- length(p)
if (n <= 1) {
a <- c()
} else {
if (n == 2) {
a <- -p[2]/p[1]
} else {
a <- diag(0, n-1, n-1)
for (i in 2:(n-1)) {
a[i, i-1] <- 1
}
a[1, ] <- -p[2:n]/p[1]
}
}
return(a)
}
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