Description Usage Arguments Details Value Author(s) See Also
Evaluates the first and zeroth order Bessel functions of the first kind at a specified non-negative real number, and returns the ratio.
1 |
kappa |
non-negative numeric value at which to evaluate the Bessel functions. |
The function uses 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).
Claudio Agostinelli
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