https://github.com/cran/pracma
Tip revision: c79a04b5074656b36e591191eb8137b70a349932 authored by Hans W. Borchers on 30 June 2014, 00:00:00 UTC
version 1.7.0
version 1.7.0
Tip revision: c79a04b
poly.Rd
\name{Poly}
\alias{Poly}
\title{Define Polynomial by Roots}
\description{
Define a polynomial by its roots.
}
\usage{
Poly(x)
}
%- maybe also 'usage' for other objects documented here.
\arguments{
\item{x}{vector or square matrix}
}
\details{
Computes the characteristic polynomial of an (n x n)-Matrix.
If \code{x} is a vector, \code{Poly(x)} is the vector of coefficients
of the polynomial whose roots are the elements of \code{x}.
}
\value{
Vector representing a polynomial.
}
\note{
In Matlab/Octave this function is called \code{poly()}.
}
\seealso{
\code{\link{polyval}}, \code{\link{roots}}
}
\examples{
Poly(c(1, -1, 1i, -1i)) # Solves x^4 -1 = 0
# Wilkinson's example:
roots(Poly(1:20))
}
\keyword{ math }