Evaluates the Bessel function of the first kind of order 0 (J0), based on the implementations of Press et al. (1986).
Press, William H., Brian P. Flannery, Saul A. Teukolsky, and William T. Vetterling. Numerical Recipes - The Art of Scientific Computing. Cambridge University Press (1986): 988 p.
function besselJ0 extends Modelica.Icons.Function; input Real x "Independent variable"; output Real J0 "Bessel function J0(x)"; end besselJ0;