The Excel BESSELJ Function

Basic Description

The Excel Besselj function returns the Bessel function, Jn(x), for a specified order and a given value of x.

The syntax of the function is :

BESSELJ( x, n )

where the function arguments are:

x - The value at which the function is to be evaluated
n -

The order of the Bessel function (must be a positive integer)

(If the supplied value of n is a decimal, Excel truncates this value to an integer)

Chart Showing Bessel Functions Jn(x), of Order 1, 2 and 3
Order 1, 2 & 3 Bessel Functions, Jn(x)

Besselj Function Example

The chart on the right shows the Bessel functions, Jn(x), of order 1, 2 and 3.

The value of any of these functions at a given value of x, can be evaluated using the Excel Besselj function.

For example, the order 1 Bessel function, at x=2.5 is calculated by the following:

=BESSELJ( 2.5, 1 )

This gives the result 0.497094103.

Further examples of the Excel Besselj function can be found on the Microsoft Office website.


Besselj Function Errors

If you get an error from the Excel Besselj function, this is likely to be one of the following :

Common Errors
#NUM! - Occurs if the supplied value of n is < 0
#VALUE! - Occurs if any of the supplied arguments are non-numeric
#NAME? -

Occurs when Analysis ToolPak add-in is not enabled in your Excel.
You will need to enable the add-in if you want to use the Excel engineering functions.

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