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Revision 161411bb86f97e5a8bd89091cd61d03a33c2761a authored by Martin Maechler on 06 February 2012, 00:00:00 UTC, committed by Gabor Csardi on 06 February 2012, 00:00:00 UTC
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Tip revision: 161411bb86f97e5a8bd89091cd61d03a33c2761a authored by Martin Maechler on 06 February 2012, 00:00:00 UTC
version 0.8-0
Tip revision: 161411b
polynEval.Rd
\name{polynEval}
\alias{polynEval}
\title{Evaluate Polynomials}
\description{
  Evaluate a univariate polynomial at \code{x} (typically a vector), that is,
  compute \code{coef[1] + coef[2]*x + ... + coef[p+1]* x^p}.
}
\usage{
polynEval(coef, x)
}
\arguments{
  \item{coef}{numeric vector.  If a vector, \code{x} can be an
    array and the result matches \code{x}.}
  \item{x}{numeric vector or array.}
}
\details{
  The stable Horner rule is used for evaluation.

  Using the C code speeds up the already fast \R code available in
  \code{\link[sfsmisc]{polyn.eval}()} in package \pkg{sfsmisc}.
}
\value{
  numeric vector or array, with the same dimensions as \code{x},
  containing the polynomial values \eqn{p(x)}.
}
\author{Martin Maechler; the \R version has been in package
  \pkg{sfsmisc} for ages.}
\seealso{For a much more sophisticated treatment of polynomials, use the
  \code{polynom} package (for example, evaluation can be done via
\code{\link[polynom]{predict.polynomial}}).
}
\examples{
polynEval(c(1,-2,1), x = -2:7) # (x - 1)^2
polynEval(c(0, 24, -50, 35, -10, 1),
          x = matrix(0:5, 2,3)) # 5 zeros!
}
\keyword{arith}
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