GNU Fortran 6
GNU Fortran 6
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9.37. BESSEL_J1

9.37 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.
Return value:
The return value is of type REAL and 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