circular (version 0.5-1)

A1: Ratio of First and Zeroth Order Bessel Functions

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)

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).

Arguments

kappa

non-negative numeric value at which to evaluate the Bessel functions.

Author

Claudio Agostinelli

Details

The function uses besselI.

See Also

besselI, A1inv.