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 $e^xK_1\left( x\right)$