Lahey/GNU Fortran

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8.26 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.
Standard:
Fortran 2008 and later
Class:
Elemental function
Syntax:
RESULT = BESSEL_J0(X)
Arguments:

X The type shall be REAL, and it shall be scalar.

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