| 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.