3.5.1.3.8 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 \(e^{-|x|}I_0(x)\).