# Documentation/How Tos/Calc: BESSELY function

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CALC FUNCTIONS

Trigonometric

Hyperbolic

Rounding and remainders

Logarithm/Powers

Bessel functions

Miscellaneous

## Contents

## BESSELY

Calculates the Bessel function of the second kind (the Neumann or Weber function).

### Syntax:

**BESSELY(x; n)**

- returns the Bessel function of the second kind, of order
, evaluated at**n**.**x**

- The Bessel functions of the second kind
(also known as Neumann*Y*(_{n}*x*)or Weber functions) are solutions to the Bessel differential equation which are singular at the origin.*N*(_{n}*x*)

### Example:

**BESSELY(4; 1)**

- returns
.**0.397925709051**

### Issues:

- This function currently appears in the AddIn category of the Function Wizard.

**See Also**