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On Wed, 22 Jun 2016 04:01 am, Pierre-Alain Dorange wrote: > Steven D'Aprano <steve at pearwood.info> wrote: > >> Are there any circumstances where math.atan2(a, b) can return an >> infinity? >> >> I know it will return a NAN under some circumstances. > > atan or atan2 can't return INFINITE, it was the arc tangent of a value, > then arc tangent can only be between -PI and +PI (is was an angle). I should hope it wouldn't. That's why I'm asking. > I do not know under what circumstance atan2 can return NAN, atan2 taks 2 > argument (y and x) and return the angle corresponding to y/x. > If x is 0.0, atan2 return 0.0 (do not try to make the division). py> math.atan2(NAN, 0) nan I think that the only way it will return a NAN is if passed a NAN. -- Steven

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