3.5.1.3.12 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.

x (input, double): The argument x of the function.
j1 (output, double): The approximation of the Bessel function of the first kind.

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