BESSELK function

Returns the modified Bessel function, which is equivalent to the Bessel functions evaluated for purely imaginary arguments.

Syntax

BESSELK(x,n)

X     is the value at which to evaluate the function.

N     is the order of the function. If n is not an integer, it is truncated.

Remarks

  • If x is nonnumeric, BESSELK returns the #VALUE! error value.
  • If n is nonnumeric, BESSELK returns the #VALUE! error value.
  • If n < 0, BESSELK returns the #NUM! error value.
  • The n-th order modified Bessel function of the variable x is:

Equation

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

Example

The example may be easier to understand if you copy it to a blank worksheet.

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Selecting an example from Help

Selecting an example from Help
  • Press CTRL+C.
  • In the worksheet, select cell A1, and press CTRL+V.
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Formula Description (Result)
=BESSELK(1.5, 1) Modified Bessel function at 1.5 with an order of 1 (0.277388)
 
 
Applies to:
Excel 2007