インテル® Fortran コンパイラー 19.0 デベロッパー・ガイドおよびリファレンス
Elemental Intrinsic Function (Generic): Computes a Bessel function of the first kind, order 0.
result = BESSEL_J0 (x)
x |
(Input) Must be of type real. |
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 zero of x.
BESSEL_J0 (1.0) has the approximate value 0.765.