## 9.3.17 ATAN (X)

Description: | Produces the arctangent of X.
Class: | Elemental function; Generic
Arguments: | X must be of type real.
Results: | The result type is the same as X and is expressed in radians. The value lies in the range -pi/2 to pi/2.

Specific Name | Argument Type | Result Type
--- | --- | ---
ATAN | REAL(4) | REAL(4)
DATAN | REAL(8) | REAL(8)
QATAN | REAL(16) | REAL(16)

Examples

ATAN (1.5874993) has the value 1.008666.

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