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

BESSEL_J1(X)¶

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.

Parameters: X – The type shall be REAL.
Returns: 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.

Standard:: Fortran 2008
Class:: Elemental function

Syntax:

RESULT = BESSEL_J1(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