ATAN2D

Elemental Intrinsic Function (Generic): Produces an arctangent. The result is the principal value of the argument of the nonzero complex number (x, y).

result = ATAN2D (y,x)

y	(Input) Must be of type real.
x	(Input) Must have the same type and kind parameters as y. If y has the value zero, x cannot have the value zero.

Results

The result type and kind is the same as x and is expressed in degrees. The value lies in the range -180 degrees to 180 degrees. If x zero, the result is approximately equal to the value of arctan (y/ x).

If y > zero, the result is positive.

If y < zero, the result is negative.

If y = zero, the result is zero (if x > zero) or 180 degrees (if x < zero).

If x = zero, the absolute value of the result is 90 degrees.

Specific Name	Argument Type	Result Type
ATAN2D	REAL(4)	REAL(4)
DATAN2D	REAL(8)	REAL(8)
QATAN2D	REAL(16)	REAL(16)

Example

ATAN2D (2.679676, 1.0) has the value 69.53546.