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MathGroup Archive 1998

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Re: unwrapping ArcTan

  • To: mathgroup at
  • Subject: [mg13744] Re: unwrapping ArcTan
  • From: Daniel Lichtblau <danl>
  • Date: Wed, 19 Aug 1998 01:38:32 -0400
  • Organization: Wolfram Research, Inc.
  • References: <6qp3g7$>
  • Sender: owner-wri-mathgroup at

Linda Rogers wrote:
> Is there code for "unwrapping" the ArcTan, so that one has a smooth
> function of phase that increases, adding 2 Pi every time a cycle is
> completed?
> Thanks,
> Linda Rogers

You might want to check the archives for May, 1998 for this news group

Look for responses to message #12213, which was in essence the same as
yours but in terms of Arg rather than ArcTan. The one I liked best I
include below.

Daniel Lichtblau
Wolfram Research

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