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This article describes the formula syntax and usage of the BESSELY  function in Microsoft Excel.


Returns the Bessel function, which is also called the Weber function or the Neumann function.



The BESSELY function syntax has the following arguments:

  • X    Required. The value at which to evaluate the function.

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


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

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

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

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



Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.




=BESSELY(2.5, 1)

Weber's Bessel function at 2.5 and an order of 1


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