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BESSELK

Syntax:

BESSELK ( x , n )

Description: The modified Bessel function Kn(x), which is equivalent to using the Bessel function Jn(x) and Yn(x).

Mathematical Formula:

The n-th order modified Bessel function of the variable x is:

where Jn and Yn are the J and Y Bessel functions, respectively.

Arguments:

Name

Type

Description

x

number

The value at which to evaluate the function.

n

number

The order of the Bessel function. This value is truncated to an integer.

 

Return Type and Value: number – The Bessel function Kn(x).

However, if n < 0, #NUM! is returned.

[Example:

BESSELK(2.345,5) results in 3.904137225

end example]