BESSEL_JN(N, X)
computes the Bessel function of the first kind of order N of X. This function is available under the name BESJN
as a GNU extension. If N and X are arrays, their ranks and shapes shall conform.
BESSEL_JN(N1, N2, X)
returns an array with the Bessel functions of the first kind of the orders N1 to N2.
Fortran 2008 and later, negative N is allowed as GNU extension
Elemental function, except for the transformational function BESSEL_JN(N1, N2, X)
RESULT = BESSEL_JN(N, X) |
RESULT = BESSEL_JN(N1, N2, X) |
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 ; for BESSEL_JN(N1, N2, X) it shall be scalar. |
The return value is a scalar of type REAL
. It has the same kind as X.
The transformational function uses a recurrence algorithm which might, for some values of X, lead to different results than calls to the elemental function.
program test_besjn real(8) :: x = 1.0_8 x = bessel_jn(5,x) end program test_besjn
Name | Argument | Return type | Standard |
DBESJN(N, X) |
INTEGER N |
REAL(8) |
GNU extension |
REAL(8) X |
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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gfortran/BESSEL_005fJN.html