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Very strange behaviour of ArcTan[]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg102656] Very strange behaviour of ArcTan[]
  • From: Alexey <lehin.p at gmail.com>
  • Date: Mon, 17 Aug 2009 08:06:56 -0400 (EDT)

Hello,
I just have discovered some strange (buggy?) feature of ArcTan[]
function in Mathematica 5.2. Try the following;

In[72]:=
ArcTan[.5,$MachinePrecision]
ArcTan[.5]

Out[72]=
1.53947

Out[73]=
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?


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