k1\_scaled = bessel\_k1\_scaled(x) evaluates an approximation to e^xK_1\left( x\right), where k_1is a modified Bessel function of the second kind. The scaling factor ex removes most of the variation in k_1.

For more information please review the s18cdc function in the NAG document.


x (input, double)
The argument x of the function. Constraint: x> 0.0.
k1\_scaled (output, double)
Approximation of e^xK_1\left( x\right)