BESSEL_JN(3f)

DESCRIPTION
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.

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)

ARGUMENTS

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.

RETURN VALUE
The return value is a scalar of type REAL. It has the same kind as 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

AUTHOR

This information was taken from the GFortran documentation (https://gcc.gnu.org/onlinedocs/gcc-5.3.0/gfortran/) and converted to a manpage by AstroFloyd (http://astrofloyd.org).