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MathGroup Archive 2006

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Re: Real numerical computations

  • To: mathgroup at
  • Subject: [mg71736] Re: Real numerical computations
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at>
  • Date: Tue, 28 Nov 2006 06:03:41 -0500 (EST)
  • Organization: The Open University, Milton Keynes, UK
  • References: <ekeb6t$t42$>

José Carlos Santos wrote:
> Hi all,
> With Mathematica, if I type
> N[(-1.)^(1/3)]
> I get
> 0.5 + 0.866025 i
> This is correct, of course, but I would like to get -1. instead. How do
> I tell Mathematica that I want a real result (if there is one)?
> Best regards,
> Jose Carlos Santos
Have a look at the technical FAQ titled "How do I get x^(1/3) (where x 
is a negative number) to evaluate to a real number?"

Best regards,

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