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8.24 ATAND — Arctangent function, degrees ¶

Description:

ATAND(X) computes the arctangent of X in degrees (inverse of TAND — Tangent function, degrees).

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	The type and kind type parameter shall be the same 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 — Tangent function, degrees Radians function: ATAN — Arctangent function