Fortran Wiki
bessel_jn

Description

bessel_jn(n, x) computes the Bessel function of the first kind of order n of x. If n and x are arrays, their ranks and shapes shall conform.

bessel_jn(n1, n2, x) returns an array with the Bessel functions of the first kind of the orders n1 to n2.

Standard

Fortran 2008 and later

Class

Elemental function, except for the transformational variant bessel_jn(n1, n2, x).

Syntax

result = bessel_jn(n, x)
result = bessel_jn(n1, n2, x)

Arguments

n - Shall be a scalar or an array of type integer.
n1 - Shall be a non-negative scalar of type integer.
n2 - Shall be a non-negative scalar of type integer.
x - Shall be a scalar or an array of type real. For bessel_jn(n1, n2, x) it shall be scalar.

Return value

The return value is a scalar of type real. It has the same kind as x.

Example

program test_besjn
  real(8) :: x = 1.0_8
  x = bessel_jn(5,x)
end program test_besjn

Fortran Wiki bessel_jn