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Re: Very strange behaviour of ArcTan
On 2009.08.17. 14:06, Alexey wrote: > Hello, > I just have discovered some strange (buggy?) feature of ArcTan > function in Mathematica 5.2. Try the following; > > In:= > ArcTan[.5,$MachinePrecision] > ArcTan[.5] > > Out= > 1.53947 > > Out= > 0.463648 > > The expression ArcTan[.5,$MachinePrecision] must (?) give an error but > in really gives some strange output without any error messages... What > do you think about this? What are you trying to do? According to the docs, "ArcTan[x,y] gives the arc tangent of y/x, taking into account which quadrant the point (x,y) is in."