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Re: Very strange behaviour of ArcTan[]

• To: mathgroup at smc.vnet.net
• Subject: [mg102662] Re: [mg102656] Very strange behaviour of ArcTan[]
• From: Louis Talman <talmanl at gmail.com>
• Date: Tue, 18 Aug 2009 06:06:56 -0400 (EDT)
• References: <200908171206.IAA06945@smc.vnet.net>

On Aug 17, 2009, at 6:06 AM, Alexey wrote:

> 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?

I think you need to run

?ArcTan

and pay attention to what the syntax

ArcTan[x, y]

accomplishes.


--Lou Talman
   Department of Mathematical and Computer Sciences
   Metropolitan State College of Denver

  <http://clem.mscd.edu/%7Etalmanl>

• References:
  • Very strange behaviour of ArcTan[]
    • From: Alexey <lehin.p@gmail.com>