29 Numerics library [numerics]

29.9 Mathematical functions for floating-point types [c.math]

29.9.5 Mathematical special functions [sf.cmath]

29.9.5.9 Irregular modified cylindrical Bessel functions [sf.cmath.cyl_bessel_k]

double cyl_bessel_k(double nu, double x); float cyl_bessel_kf(float nu, float x); long double cyl_bessel_kl(long double nu, long double x);
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Effects: These functions compute the irregular modified cylindrical Bessel functions of their respective arguments nu and x.
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Returns:

where ν is nu and x is x.

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Remarks: The effect of calling each of these functions is implementation-defined if nu >= 128.
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