# Bessel_k1_scaled

Bessel-k1-scaled-func

## Definition:

evaluates an approximation to , where is a modified Bessel function of the second kind. The scaling factor ex removes most of the variation in .

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.
- (output, double)
- Approximation of