CircStats: A1 – R documentation

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A1

Ratio of First and Zeroth Order Bessel Functions

Evaluates the first and zeroth order Bessel functions of the first kind at a specified non-negative real number, and returns the ratio.

A1(kappa)

kappa

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

The function use besselI.

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).