Intel® Fortran Compiler 16.0 User and Reference Guide

BESSEL_J1

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.

Results

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.

Example

BESSEL_J1 (1.0) has the approximate value 0.440.