#
Fortran Wiki

bessel_j1

## Description

`bessel_j1(x)`

computes the Bessel function of the first kind of order 1 of `x`

.

## Standard

Fortran 2008 and later

## Class

Elemental function

## Syntax

`result = bessel_j1(x)`

## Arguments

`x`

- The type shall be `real`

, and it shall be scalar.

## Return value

The return value is of type `real`

and it lies in the range $- 0.5818... \leq Bessel (0,x) \leq 0.5818$. It has the same kind as `x`

.

## Example

```
program test_besj1
real(8) :: x = 1.0_8
x = bessel_j1(x)
end program test_besj1
```

Revised on April 30, 2009 20:35:57
by

Jason Blevins
(71.70.142.190)
(616 characters / 0.0 pages)