Translations:Documentation/Calc Functions/BESSELI/17/en
The following figure shows a plot of the modified Bessel functions of the first kind for orders 0, 1, 2, and 3.
Modified Bessel functions of the first kind are finite at the origin, x = 0. They exhibit odd or even parity depending on the order of the function, so that In(-x) = In(x) for even orders and In(-x) = -In(x) for odd orders.