3.5.1.3.18 Bessel_k1_scaled

Definition:

\(k1\_scaled = bessel\_k1\_scaled(x)\) evaluates an approximation to \(e^xK_1\left( x\right)\), where \(k_1\)is 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.

Parameters:

x (input, double)

The argument x of the function. Constraint: x> 0.0.

\(k1\_scaled\) (output, double)

Approximation of \(e^xK_1\left( x\right)\)