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	Spreadsheet Mathematical Functions Data Entry Tips for Functions

BESSELY

Description: Returns the Bessel function Yn(x), which is also called the Weber function or the Neumann function.

Syntax: BESSELY(Number, Order)

• Number is the value at which to evaluate the function.

• Order is the order of the 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:

where

Example:

• Compute the Bessel function at x = 2.5 and an order of n = 1.

BESSELY(2.5, 1) = 0.145918