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Arg
 Arg[z] gives the argument of the complex number z.
Mathematical function (see Section A.3.10).
Arg[z] is left unevaluated if z is not a numeric quantity.
Arg[z] gives the phase angle of z in radians.
The result from Arg[z] is always between  and  .
Arg[z] has a branch cut discontinuity in the complex z plane running from  to  .
See The Mathematica Book: Section 1.1.5 and Section 3.2.2.
See also: ArcTan, Sign.
Further Examples
THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT. SEE THE DOCUMENTATION CENTER FOR THE LATEST INFORMATION. | 
