Elemental and Transformational Intrinsic Functions (Generic): Compute Bessel functions of the first kind.
Elemental function: result = BESSEL_JN (n, x)
Transformational function: result = BESSEL_JN (n1, n2, x)
n, n1, n2 |
(Input) Must be of type integer and nonnegative. |
x |
(Input) Must be of type real. |
The result type and kind is the same as x.
The result of BESSEL_JN (n, x) is scalar. The result value of BESSEL_JN (n , x) is a processor-dependent approximation to the Bessel function of the first kind and order n of x.
The result of BESSEL_JN (n1, n2, x) is a rank-one array with extent MAX (n2 - n1 + 1, 0). Element i of the result value of BESSEL_JN (n1, n2, x) is a processor-dependent approximation to the Bessel function of the first kind and order n1 + i - 1 of x.
BESSEL_JN (2, 1.0) has the approximate value 0.115.
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