9.24 ATAND — Arctangent function, degrees

Description:

ATAND(X) computes the arctangent of X in degrees (inverse of TAND).

This function is for compatibility only and should be avoided in favor of standard constructs wherever possible.

Standard:

GNU Extension, enabled with -fdec-math.

Class:

Elemental function

Syntax:

RESULT = ATAND(X)

RESULT = ATAND(Y, X)

Arguments:

X	The type shall be REAL or COMPLEX; if Y is present, X shall be REAL.
Y shall be of the same type and kind as X.

Return value:

The return value is of the same type and kind as X. If Y is present, the result is identical to ATAND2(Y,X). Otherwise, it is the arcus tangent of X, where the real part of the result is in degrees and lies in the range -90 \leq \Re \atand(x) \leq 90.

Example:

program test_atand
  real(8) :: x = 2.866_8
  x = atand(x)
end program test_atand

Specific names:

Name	Argument	Return type	Standard
ATAND(X)	REAL(4) X	REAL(4)	GNU Extension
DATAND(X)	REAL(8) X	REAL(8)	GNU Extension

See also:

Inverse function: TAND Radians function: ATAN