# BESSELK Function

The BESSELK function is one of the engineering functions. It is used to return the modified Bessel function, which is equivalent to the Bessel functions evaluated for purely imaginary arguments.

The BESSELK function syntax is:

BESSELK(X, N)

where

X is the value at which to evaluate the function, a numeric value greater than 0,

N is the order of the Bessel function, a numeric value greater than or equal to 0.

The numeric values can be entered manually or included into the cell you make reference to.

To apply the BESSELK function,

1. select the cell where you wish to display the result,
2. click the Insert function icon situated at the top toolbar,
   or right-click within a selected cell and select the Insert Function option from the menu,
   or click the icon situated at the formula bar,
3. select the Engineering function group from the list,
4. click the BESSELK function,
5. enter the required arguments separating them by comma,
6. press the Enter button.

The result will be displayed in the selected cell.