Intel® Fortran Compiler 17.0 Developer Guide and Reference
Elemental Intrinsic Function (Generic): Computes a Bessel function of the first kind, order 1.
result = BESSEL_J1 (x)
x |
(Input) Must be of type real. |
The result type and kind is the same as x.
The result has a value equal to a processor-dependent approximation to the Bessel function of the first kind and order 1 of x.
BESSEL_J1 (1.0) has the approximate value 0.440.