3.5.2.5.11 Bessel_j0

Definition:

j0= bessel\_j0(x), evaluates the Bessel function of the first kind,J_0(x) . The approximation is based on Chebyshev expansions.

For more information please review the s17aec function in the NAG document.

Parameters:

x (input, double)
The argument x of the function.
j0 (output, double)
The approximation of the Bessel function.