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 $e^{-|x|}I_0(x)$ .

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