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)
|N||Shall be a scalar or an array of type
|N1||Shall be a non-negative scalar of type
|N2||Shall be a non-negative scalar of type
|X||Shall be a scalar or an array of type
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
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