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.

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



program test_besj1

  real(8) :: x = 1.0_8

  x = bessel_j1(x)

end program test_besj1

Specific names

Name Argument Return type Standard
DBESJ1(X) REAL(8) X REAL(8) GNU extension

Standard

Fortran 2008

Class

Elemental function

Name	Argument	Return type	Standard
`DBESJ1(X)`	`REAL(8) X`	`REAL(8)`	GNU extension