Revision d50cda4811eb3cdb8d2ce9e01ddb5e07d4a8c24f authored by HwB on 11 September 2013, 00:00:00 UTC, committed by Gabor Csardi on 11 September 2013, 00:00:00 UTC
1 parent 10ae2bb
compan.Rd
\name{compan}
\alias{compan}
\title{Companion Matrix}
\description{
Computes the companion matrix of a vector.
}
\usage{
compan(p)
}
\arguments{
\item{p}{vector representing a polynomial}
}
\details{
Computes the companion matrix corresponding to the vector \code{p}
with \code{-p[2:length(p)]/p[1]} as first row.
The eigenvalues of this matrix are the roots of the polynomial.
}
\value{
A square matrix of \code{length(p)-1} rows and columns
}
\seealso{
\code{\link{roots}}
}
\examples{
p <- c(1, 0, -7, 6)
compan(p)
# 0 7 -6
# 1 0 0
# 0 1 0
}
\keyword{ array }
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