Bessel_j1

Definition:

\(j1= bessel\_j1(x)\), evaluates an approximation to the Bessel function of the first kind \(J_1(x)\) .

The function is based on Chebyshev expansions.

For more information please review the s17afc function in the NAG document.

Parameters:

x (input, double)

The argument x of the function.

j1 (output, double)

The approximation of the Bessel function of the first kind.