Nothing
`INSTFREQS` <-
function(b,a,w)
{
apolyval<-function (coef, z)
{
lz <- length(z)
if (!lz)
return(numeric(0))
n <- length(coef)
if (!n) {
z[] <- 0
return(z)
}
if (!(mode(coef) == "numeric") && !(mode(coef) == "complex"))
stop("Argument 'coef' must be a real or complex vector.")
d_z <- dim(z)
dim(z) <- lz
y <- outer(z, (n - 1):0, "^") %*% coef
dim(y) <- d_z
return(y)
}
s = complex(real=0, imaginary=1)*w;
h = apolyval(b,s) / apolyval(a,s)
return(h)
}
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