A1FirstDerivative {circular} | R Documentation |
Evaluates the first derivative of the Ratio of First and Zeroth Order Bessel Functions
A1FirstDerivative(kappa)
kappa |
non-negative numeric value at which to evaluate the first derivative of A1 function. |
The formula (3.48) of Fisher (1993), pag. 52 is implemented.
The function uses A1
and besselI
.
The value of the first derivative of A1 function in the point kappa
.
Claudio Agostinelli and Alessandro Gagliardi.
N.I. Fisher (1993) Statistical Analysis of Circular Data, Cambridge University Press.