ACOS (The GNU Fortran Compiler)

Description:

ACOS(X) computes the arccosine of X (inverse of COS(X)).

Standard:

Fortran 77 and later, for a complex argument Fortran 2008 or later

Class:

Elemental function

Syntax:

RESULT = ACOS(X)

Arguments:

`X`	The type shall either be `REAL` with a magnitude that is less than or equal to one - or the type shall be `COMPLEX`.

Return value:

The return value is of the same type and kind as X. The real part of the result is in radians and lies in the range 0 \leq \Re \acos(x) \leq \pi.

Example:

program test_acos
  real(8) :: x = 0.866_8
  x = acos(x)
end program test_acos

Specific names:

Name	Argument	Return type	Standard
`ACOS(X)`	`REAL(4) X`	`REAL(4)`	Fortran 77 and later
`DACOS(X)`	`REAL(8) X`	`REAL(8)`	Fortran 77 and later

See also: