ATAN — Arctangent function#
-
ATAN(X)#
ATAN(X)
computes the arctangent ofX
.- Parameters
X – The type shall be
REAL
orCOMPLEX
; ifY
is present,X
shall be REAL.Y – The type and kind type parameter shall be the same as
X
.
- Returns
The return value is of the same type and kind as
X
. IfY
is present, the result is identical toATAN2(Y,X)
. Otherwise, it the arcus tangent ofX
, where the real part of the result is in radians and lies in the range -pi/2 leq Re atan(x) leq pi/2.
- Standard:
Fortran 77 and later, for a complex argument and for two arguments Fortran 2008 or later
- Class:
Elemental function
- Syntax:
RESULT = ATAN(X) RESULT = ATAN(Y, X)
- Example:
program test_atan real(8) :: x = 2.866_8 x = atan(x) end program test_atan
- Specific names:
Name
Argument
Return type
Standard
ATAN(X)
REAL(4) X
REAL(4)
Fortran 77 and later
DATAN(X)
REAL(8) X
REAL(8)
Fortran 77 and later
- See also: