7.18 BESJ0 — Bessel function of the first kind of order 0

Description:

BESJ0(X) computes the Bessel function of the first kind of order 0 of X.

Option:

gnu

Class:

elemental function

Syntax:

X = BESJ0(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 - 0.4027... \leq Bessel (0,x) \leq 1.

Example:

          program test_besj0
            real(8) :: x = 0.0_8
            x = besj0(x)
          end program test_besj0
     

Specific names:

Name	Argument	Return type	Option
DBESJ0(X)	REAL(8) X	REAL(8)	gnu