3.5.2.5.20 Bessel_y1

Definition:

y1 = bessel\_y1(x) evaluates the Bessel function of the second kind,Y_1 , x > 0.

The approximation is based on Chebyshev expansions.

For more information please review the s17adc function in the NAG document.


Parameters:

x (input, double)
The argument x of the function.
Constraint: x>0.0
y1 (output, double)
The approximation of the Bessel function of the second kind.