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Description: Returns the modified Bessel function ln(x), which is equivalent to the Bessel function evaluated for purely imaginary arguments.
Syntax: BESSELI(Number, Order)
Number is the value at which to evaluate the function.
Order is the order of the Bessel function.
Remarks:
Both arguments must be numerical.
Order must be >= 0 and an integer.
The n-th order modified Bessel function of the variable x is:
Example:
Compute the modified Bessel function at x = 1.5 with an order of n = 1.
BESSELI(1.5, 1) = 0.981666
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