Density for the axial von Mises circular distribution.
daxialvonmises(x, mu, kappa, l = 2)a vector. The object is coerced to class circular.
mean direction of the distribution. The object is coerced to class circular
non-negative numeric value for the concentration parameter of the distribution.
a positive number. l=2 provide the axial distribution in the range [0, pi].
daxialvonmises gives the density.
Jammalamadaka, S. Rao and SenGupta, A. (2001). Topics in Circular Statistics, Section 2.2.4, World Scientific Press, Singapore.