BESSEL_J1 — Bessel function of the first kind of order 1#
-
BESSEL_J1(X)#
BESSEL_J1(X)
computes the Bessel function of the first kind of order 1 ofX
. This function is available under the nameBESJ1
as a GNU extension.- Parameters
X – The type shall be
REAL
.- Returns
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 asX
.
- Standard:
Fortran 2008
- Class:
Elemental function
- Syntax:
RESULT = BESSEL_J1(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