Intel® Fortran Compiler 18.0 Developer Guide and Reference
Elemental Intrinsic Function (Generic): Produces the arctangent of an argument.
result = ATAN (x)
result = ATAN (y,x)
y |
(Input) Must be of type real. |
x |
(Input) If y appears, x must be of type real with the same kind type parameter as y. If y has the value zero, x must not have the value zero. If y does not appear, x must be of type real or complex. |
The result type and kind are the same as x.
If y appears, the result is the same as the result of ATAN2 (y, x).
If y does not appear, the real part of the result is expressed in radians and lies in the range -pi/2 <= ATAN (x) <= pi/2.
Specific Name |
Argument Type |
Result Type |
|---|---|---|
ATAN |
REAL(4) |
REAL(4) |
DATAN |
REAL(8) |
REAL(8) |
QATAN |
REAL(16) |
REAL(16) |
ATAN (1.5874993) has the value 1.008666.
ATAN (2.679676, 1.0) has the value 1.213623.