Kelvin_ber
Definition:
/math-9dc13ed9fbbb426ae489125b0adab021.png "ber = kelvin\_ber(x)")
evaluates an approximation to the Kelvin function ber x.
The function is based on several Chebyshev expansions. For large x, there is a danger of the result being totally inaccurate, as the error amplification factor grows in an essentially exponential manner; therefore the function must fail.
For more information please review the s19aac function in the NAG document
Parameters:
- x (input, double)
- The argument x of the function.
- ber (output, double)
- Approximation of the Kelvin function ber x.