BESSEL_JN — Bessel function of the first kind#
-
BESSEL_JN(N, X)#
BESSEL_JN(N, X)
computes the Bessel function of the first kind of orderN
ofX
. This function is available under the nameBESJN
as a GNU extension. IfN
andX
are arrays, their ranks and shapes shall conform.- Parameters
N – Shall be a scalar or an array of type
INTEGER
.N1 – Shall be a non-negative scalar of type
INTEGER
.N2 – Shall be a non-negative scalar of type
INTEGER
.X – Shall be a scalar or an array of type
REAL
; forBESSEL_JN(N1, N2, X)
it shall be scalar.
- Returns
The return value is a scalar of type
REAL
. It has the same kind asX
.
- Standard:
Fortran 2008 and later, negative
N
is allowed as GNU extension- Class:
Elemental function, except for the transformational function
BESSEL_JN(N1, N2, X)
- Syntax:
RESULT = BESSEL_JN(N, X) RESULT = BESSEL_JN(N1, N2, X)
- Note:
The transformational function uses a recurrence algorithm which might, for some values of
X
, lead to different results than calls to the elemental function.- Example:
program test_besjn real(8) :: x = 1.0_8 x = bessel_jn(5,x) end program test_besjn
- Specific names:
Name
Argument
Return type
Standard
DBESJN(N, X)
INTEGER N
REAL(8)
GNU extension
REAL(8) X