ATAN

Elemental Intrinsic Function (Generic): Produces the arctangent of x.

Syntax

result = ATAN (x)

x
(Input) 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)

Example

ATAN (1.5874993) has the value 1.008666.