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.