Bessel_i1
Definition:
/math-2f3352dae1316588cfd0e7755551c3f6.png "i1 = bessel\_i1(x)")
evaluates an approximation to the modified Bessel function of the first kind,/math-2f7828c97430a57b061a8d47864a43b2.png "I_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.
- i1 (output, double)
- Approximation of to the modified Bessel function of the first kind.