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