# BESSELK

## Content

This function calculates the modified Bessel function of the second kind evaluated for purely imaginary arguments.

## Syntax

`BESSELK(value, order)`

## Arguments

This function has these arguments:

| Argument | Description |
| -------- | ----------- |
| *value* | [Required] Value at which to evaluate the function |
| *order* | [Required] Number representing the order of the function; if it is not an integer, it is truncated |

## Remarks

This function is also called the Neumann function. If the value or order is non-numeric then a #VALUE! error is returned. If the order is less than 0 then the #NUM! error is returned.

## Examples

`BESSELK(A4,D5)`
`BESSELK(R4C1,R5C4)`
`BESSELK(1.85,2)` gives the result 0.32165378