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\name{A1}
\title{Ratio of First and Zeroth Order Bessel Functions}
\alias{A1}
\description{Evaluates the first and zeroth order Bessel functions of the first kind at a specified non-negative real number, and returns the ratio.}
\usage{
A1(kappa)
}
\arguments{
\item{kappa}{non-negative numeric value at which to evaluate the Bessel functions.}
}
\value{
If I1(kappa) is the first order Bessel function and I0(kappa) is the zeroth order Bessel function, then A1(kappa) returns I1(kappa)/I0(kappa).
}
\details{
The function uses \code{\link{besselI}}.
}
\author{Claudio Agostinelli}
\seealso{
\code{\link{besselI}}, \code{\link{A1inv}}.
}
\keyword{math}
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