# Manuals/calci/BESSELJ

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**BESSELJ(x,n)**

- is the value to evaluate the function
- is the order of the Bessel function and is an integer.
- BESSELJ(), returns the modified Bessel Function Jn(x).

## Description

- This function gives the value of the modified Bessel function.
- Bessel functions is also called Cylinder Functions because they appear in the solution to Laplace's equation in cylindrical coordinates.
- Bessel's Differential Equation is defined as:

where is the arbitrary Complex Number.

- But in most of the cases is the non-negative real number.
- The solutions of this equation are called Bessel Functions of order n.
- Bessel functions of the first kind, denoted as
- The Bessel function of the first kind of order can be expressed as:

- where or
- is the Gamma Function.
- This function will give result as error when

1. or is non numeric 2. , because is the order of the function.

## ZOS

- The syntax is to calculate BESSELJ in ZOS is .
- is the value to evaluate the function
- is the order of the Bessel function and is an integer.

- For e.g.,BESSELJ(0.789..0.901..0.025,5)

## Examples

- BESSELJ(2,3) = 0.12894324997562717
- BESSELJ(7,2) = -0.3014172238218034
- BESSELJ(5,1) = -0.3275791385663632

## Related Videos

## See Also

## References