BESSEL_J0 — Bessel function of the first kind of order 0

Description

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.

Syntax

RESULT = BESSEL_J0(X)

Arguments

X The type shall be REAL.

Return value

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.

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

Standard

Fortran 2008 and later

Class

Elemental function

Name	Argument	Return type	Standard
`DBESJ0(X)`	`REAL(8) X`	`REAL(8)`	GNU extension