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MathGroup Archive 2003

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Re: a first-time user question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39376] Re: a first-time user question
  • From: nilton.volpato at ig.com.br (Nilton Volpato)
  • Date: Thu, 13 Feb 2003 04:53:04 -0500 (EST)
  • References: <b2d0su$e65$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Use:

Needs["Miscellaneous'RealOnly'"]

Plot[x^(2/3), {x,-1,0}]

This will work.

-- Nilton

"Ye Hu" <huye at wharton.upenn.edu> wrote in message news:<b2d0su$e65$1 at smc.vnet.net>...
> I have a simple (supposedly) question...
> 
> I used the following command to draw a plot, but Mathematica could not run
> properly.
> 
> Plot[x^(2/3),{x,-1,0}]
> 
> 
> I know the problem is about calculating (-1)^(1/3) in mathematica. Although
> (-1)^(1/3) = -1,
> mathematica tries to calculate it numerically and gives complex results
> 0.5+0.8i
> How to solve this problem and restrict the solution to be only real numbers?
> 
> Thanks very much.


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