R: Ratio of First and Zeroth Order Bessel Functions

A1 {circular} | R Documentation

## 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)

### Arguments

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

### Details

The function uses `besselI`.

### 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).

### Author(s)

Claudio Agostinelli

### See Also

`besselI`, `A1inv`.

[Package circular version 0.4-93 Index]