9.41. BESSEL_J1

9.41 BESSEL_J1 — Bessel function of the first kind of order 1

Description:

BESSEL_J1(X) computes the Bessel function of the first kind of order 1 of X. This function is available under the name BESJ1 as a GNU extension.

Standard:

Fortran 2008

Class:

Elemental function

Syntax:

RESULT = BESSEL_J1(X)

Arguments:

X	The type shall be REAL.

Return value:

The return value is of type REAL and lies in the range - 0.5818... \leq Bessel (0,x) \leq 0.5818 . It has the same kind as X.

Example:

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