k0\_scaled = bessel\_k0\_scaled(x) evaluates an approximation to e^xK_0\left( x\right), where K_0 is a modified Bessel function of the second kind. The scaling factor e^x removes most of the variation in K_0\left( x\right).

For more information please review the s18ccc function in the NAG document.


x (input, double)
The argument x of the function. Constraint: x> 0.0.
k0\_scaled (output, double)
Approximation of e^xK_0\left( x\right)