# 3.5.2.5.10 Bessel_i1_scaled

## Definition:

$i1\_scaled = bessel\_i1\_scaled(x)$ evaluates an approximation to $e^{-|x|}I_1(x)$, where $I_1(x)$ is a modified Bessel function of the first kind. The scanling factor $e^{-|x|}$ removes most of the variation in $I_1(x)$.

Approximation of $e^{-|x|}I_1(x)$.