BESSELI function

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



X     is the value at which to evaluate the function.

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


  • If x is nonnumeric, BESSELI returns the #VALUE! error value.

  • If n is nonnumeric, BESSELI returns the #VALUE! error value.

  • If n < 0, BESSELI returns the #NUM! error value.

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



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

How to copy an example

  1. Create a blank workbook or worksheet.

  2. Select the example in the Help topic.

    Note   Do not select the row or column headers.

    Selecting an example from Help

    Selecting an example from Help

  3. Press CTRL+C.

  4. In the worksheet, select cell A1, and press CTRL+V.

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Description (Result)

=BESSELI(1.5, 1)

Modified Bessel function at 1.5 with an order of 1 (0.981666)

Applies To: Excel 2007

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