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On 7 Sep 2006, at 21:57, Asko Kauppi wrote:



Thanks:  was simply using the wrong formulas for pow.

Now, it still gives innacurate answers, but close to -1:

  Lua 5.1.1  Copyright (C) 1994-2006 Lua.org, PUC-Rio (complex)
  > a=1i
  > =a^2
  -1+1.2246467991474e-16i
Should something be done about this (like handling real powers separately)?
You mean you're not using <complex.h> and therefore cpow? I would expect any respectable cpow to handle integer y separately. 

And if you're rolling you're own, then yes you should.

drj