3.5.1.3.49 Kelvin_kei

Kelvin-kei-func

Definition:

evaluates an approximation to the Kelvin function kei x. The function is based on several Chebyshev expansions. For large x, kei x is so small that it cannot be computed without underflow and the function fails.

For more information please review the s19adc function in the NAG document.

Parameters:

x (input, double)

The argument x of the function.

Constraint: x ≥ 0.

kei (output, double)

Approximation of the Kelvin function kei x.