BESSEL_J0 — Bessel function of the first kind of order 0#

BESSEL_J0(X)#

BESSEL_J0(X) computes the Bessel function of the first kind of order 0 of X. This function is available under the name BESJ0 as a GNU extension.

Parameters:

X – The type shall be REAL.

Returns:

The return value is of type REAL and lies in the range - 0.4027… leq Bessel (0,x) leq 1. It has the same kind as X.

Standard:

Fortran 2008 and later

Class:

Elemental function

Syntax:
RESULT = BESSEL_J0(X)
Example:
program test_besj0
  real(8) :: x = 0.0_8
  x = bessel_j0(x)
end program test_besj0
Specific names:

Name

Argument

Return type

Standard

DBESJ0(X)

REAL(8) X

REAL(8)

GNU extension