The system function MathLib.atan returns the arctangent of a number. The result is in radians and is in the range of -pi/2 and pi/2.
MathLib.atan(numericField mathLibNumber in) returns (result mathLibTypeDependentResult)
result = MathLib.atan(myItem);
Related concepts
Syntax diagram for EGL functions
Related reference
EGL library MathLib