## 9.3.20 ATAN2D (Y, X)

Description: | Produces an arctangent. The result is the principal value of the argument of the nonzero complex number (X, Y).
Class: | Elemental function; Generic
Arguments:1 | Y | Must be of type real.
| X | Must have the same type and kind parameters as Y.
Results: | The result type 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.
1 Both arguments must not have the value zero.

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

Examples

ATAN2D (2.679676, 1.0) has the value 69.53546.

Previous Page Next Page Table of Contents