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8.20 BESJ1 — Bessel function of the first kind of order 1

Description:
BESJ1(X) computes the Bessel function of the first kind of order 1 of X.
Option:
gnu
Class:
elemental function
Syntax:
X = BESJ1(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 .
Example:
          program test_besj1
            real(8) :: x = 1.0_8
            x = besj1(x)
          end program test_besj1
     

Specific names:

Name Argument Return type Option
DBESJ1(X)REAL(8) X REAL(8) gnu