3.5.2.5.8 Bessel_i0_scaled

Definition:

i0\_scaled = bessel\_i0\_scaled(x) evaluates an approximation to e^{-|x|}I_0(x), where IO is a modified Bessel function of the first kind. The scaling factor e^{-|x|} removes most of the variation in I_0(x).

For more information please review the s8cec function in the NAG document.

Parameters:

x (input, double)
The argument x of the function.
i0_scaled (output, double)
Approximation of e^{-|x|}I_0(x).