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\name{A1FirstDerivative}
\title{First derivative of the Ratio of First and Zeroth Order Bessel Functions.}
\alias{A1FirstDerivative}
\description{Evaluates the first derivative of the Ratio of First and Zeroth Order Bessel Functions}
\usage{
A1FirstDerivative(kappa)
}
\arguments{
\item{kappa}{non-negative numeric value at which to evaluate the first derivative of A1 function.}
}
\value{
The value of the first derivative of A1 function in the point \code{kappa}.
}
\details{
The formula (3.48) of Fisher (1993), pag. 52 is implemented.
The function uses \code{\link{A1}} and \code{\link{besselI}}.
}
\author{Claudio Agostinelli and Alessandro Gagliardi.}
\references{
N.I. Fisher (1993) Statistical Analysis of Circular Data, Cambridge University Press.
}
\seealso{
\code{\link{A1}}, \code{\link{besselI}}, \code{\link{A1inv}}.
}
\keyword{math}
|
