Exponentially scaled modified Bessel function of order 1:
\(\mathrm{i1e}(x) = e^{-|x|} \mathrm{i1}(x)\).
Parameters:
x (saiunit.Quantity | Array | ndarray | bool | number | bool | int | float | complex) – Input array. Must be dimensionless or scaled via unit_to_scale.
unit_to_scale (saiunit.Unit | None) – If provided, x is scaled by this unit before applying the function.