3.5.2.5.15 Bessel k0

Definition:

k0 = bessel\_k0(x) evaluates an approximation to the modified Bessel function of the second kind,K_0\left( x\right). The function is based on Chebyshev expansions.

For more information please review the s18acc function in the NAG document.


Parameters:

x (input, double)
The argument x of the function. Constraint: x> 0.0.
k0 (output, double)
Approximation of the modified Bessel function of the second kind.