Lahey/GNU Fortran

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8.27 BESSEL_J1 — Bessel function of the first kind of order 1

Description:
BESSEL_J1(X) computes the Bessel function of the first kind of order 1 of X. This function is available under the name BESJ1 as a GNU extension.
Standard:
Fortran 2008
Class:
Elemental function
Syntax:
RESULT = BESSEL_J1(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 - 0.5818... \leq Bessel (0,x) \leq 0.5818 . It has the same kind as X.
Example:
          program test_besj1
            real(8) :: x = 1.0_8
            x = bessel_j1(x)
          end program test_besj1
     

Specific names:

Name Argument Return type Standard
DBESJ1(X) REAL(8) X REAL(8) GNU extension