double cyl_neumann(double nu, double x);
float cyl_neumannf(float nu, float x);
long double cyl_neumannl(long double nu, long double x);
Effects: These functions compute the cylindrical Neumann functions, also known as the cylindrical Bessel functions of the second kind, of their respective arguments nu and x.
Returns:
Nν(x)=⎧⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪⎨⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪⎩Jν(x)cosνπ−J−ν(x)sinνπ,for x≥0 and non-integral νlimμ→νJμ(x)cosμπ−J−μ(x)sinμπ,for x≥0 and integral ν
where ν is nu and x is x.
See also [sf.cmath.cyl_bessel_j].