Bessel_j1
Definition:
/math-78049a6a6891b1e0f1517b21bf9d9948.png "j1= bessel\_j1(x)")
, evaluates an approximation to the Bessel function of the first kind /math-c9f382d6ab39f9514fc4481cf8faad1b.png "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.