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Re: Taking the Arg of a complex number

  • To: mathgroup at
  • Subject: [mg122164] Re: Taking the Arg of a complex number
  • From: Ben Gear <bjgear at>
  • Date: Mon, 17 Oct 2011 08:10:22 -0400 (EDT)
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  • References: <j73grj$fvk$>
  • Reply-to: comp.soft-sys.math.mathematica at

Thanks all for the replies.

Simon's answer seems the most satisfying, interesting that a 'FullSimplify' is required. Refine and Simplify don't cut it (still not 100% how these three differ). I was also being a bit thick about the range of phi I was using.  Getting an answer of ArcTan[Cos[phi], Sin[phi]] also makes sense when the range of phi is not defined.

To those who have suggested that the issue was due to Arg[z] not being evaluated unless z is numeric, as stated in the documentation - this was my first thought, however I think this means that Arg['symbolic variable'] can't be evaluated (which makes sense), rather than Arg['symbolic expression'] can't be evaluated.



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