Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 3/31/2023
Public

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Document Table of Contents

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 are 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.