Wolfram Language & System 11.0 (2016)|Legacy Documentation

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gives the argument of the complex number z.


  • Mathematical function, suitable for both symbolic and numerical manipulation.
  • 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 0.
  • Arg[0] gives 0.
  • Arg automatically threads over lists.
Introduced in 1988
| Updated in 2007