a first-time user question

*To*: mathgroup at smc.vnet.net*Subject*: [mg39352] a first-time user question*From*: "Ye Hu" <huye at wharton.upenn.edu>*Date*: Wed, 12 Feb 2003 03:52:57 -0500 (EST)*Organization*: University of Pennsylvania*Sender*: owner-wri-mathgroup at wolfram.com

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.

**Follow-Ups**:**Re: a first-time user question***From:*"German Buitrago A." <gerbual@col2.telecom.com.co>

**Re: a first-time user question***From:*Dr Bob <drbob@bigfoot.com>

**Re: a first-time user question***From:*Tomas Garza <tgarza01@prodigy.net.mx>