Fortran Wiki
acos

Description

acos(x) computes the arccosine of x (inverse of cos(x)).

Standard

FORTRAN 77 and later

Class

Elemental function

Styntax

result = acos(x)

Arguments

  • x - The type shall be real with a magnitude that is less than one.

Return value

The return value is of type real and it lies in the range 0acos(x)π0 \leq \acos(x) \leq \pi. The return value if of the same kind as x.

Example

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

See also

Inverse function: cos

category: intrinsics