29.9 Mathematical functions for floating-point types [c.math]
double cyl_bessel_j(double nu, double x);
float cyl_bessel_jf(float nu, float x);
long double cyl_bessel_jl(long double nu, long double x);
Effects:
These functions compute
the cylindrical Bessel functions of the first kind
of their respective arguments
nu and
x. Returns:
where
ν is nu and
x is x.
Remarks:
The effect of calling each of these functions
is
implementation-defined
if
nu >= 128.