ATAN(X)
Purpose
Arctangent (inverse tangent) function.
Class
Elemental function
Argument type and attributes
X
must be of type real.
Result type and attributes
Same as X.
Result value
It is expressed in radians and approximates arctan(X).
It is in the range -
PI
/2 <= ATAN(X) <=
PI
/2.
Examples
ATAN
(1.0) approximates
PI
/4.
Specific Name
Argument Type
Result Type
Pass As Arg?
ATAN
default real
default real
yes
DATAN
double precision real
double precision real
yes
QATAN
1
REAL(16)
REAL(16)
yes
Notes:
IBM Extension.