## Excel BESSELI Function

### Description

The Excel BESSELI function calculates the modified Bessel function, which is equivalent to the Bessel function evaluated for purely imaginary arguments.

### Syntax and arguments

Formula syntax

BESSELI(x, n)

Arguments

 X: Required, the value at which the function is to be evaluated. N: Required, the order of the Bessel function. Normally, it is an integer, if it is a decimal, it will be truncated.

### Return Value

The BESSELI function returns a numeric value.

### Remark

The n-th order modified Bessel function of the variable x is:

### Error

1. When any arguments of BESSELI function are nonnumeric values, #VALUE! value will be returned.

2. When argument n is less than zero, #NUM! value will be returned.

### Version

Excel 2003 and later

### Usage and Examples

Example

To calculate the modified Bessel function at 5 with an order of 2, please use the formula:

=BESSELI(B4,C4)

Or directly type the values in the function

=BESSELI(5,2)

Press Enter key to get the result.

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