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8.19 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