Re: a first-time user question

*To*: mathgroup at smc.vnet.net*Subject*: [mg39366] Re: a first-time user question*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Thu, 13 Feb 2003 04:51:45 -0500 (EST)*Organization*: Universitaet Leipzig*References*: <b2d0su$e65$1@smc.vnet.net>*Reply-to*: kuska at informatik.uni-leipzig.de*Sender*: owner-wri-mathgroup at wolfram.com

Hi, Needs["Miscellaneous`RealOnly`"] Plot[x^(2/3), {x, -1, 0}] works as you expect. Regards Jens Ye Hu wrote: > > 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.