# BESSELI

Spread for WinForms provides advanced software components that support Excel import/export, full cell customization, an extensive calculation engine with over 450 functions and more, all with zero dependencies on Excel.

## Content



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

## Syntax

BESSELI(*value*,*order*)

## Arguments

This function has these arguments:

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

## Remarks

If value or order is nonnumeric then a #Value! error is returned. If order is less than 0 then the #NUM! error is returned.

## Data Types

Accepts numeric data for both arguments. Returns numeric data.

## Examples

`BESSELI(A4,D5)`
`BESSELI(R4C1,R5C4)`
`BESSELI(1.8,2)` gives the result 0.5260402117

## Version Available

This function is available in product version 1.0 or later.

## See Also

[BESSELJ](/spreadnet/docs/latest/online-formula/formulas-functionsall/formulas-functsAtoC/FunctionBESSELJ) \| [BESSELY](/spreadnet/docs/latest/online-formula/formulas-functionsall/formulas-functsAtoC/FunctionBESSELY) \| [Engineering Functions](/spreadnet/docs/latest/online-formula/formulas-overview/formulas-functs/formulas-functtypes/formulas-functsengineer)