Re: What to do in v. 6 in place of Miscellaneous`RealOnly

*To*: mathgroup at smc.vnet.net*Subject*: [mg76653] Re: What to do in v. 6 in place of Miscellaneous`RealOnly*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Fri, 25 May 2007 06:35:39 -0400 (EDT)*Organization*: Uni Leipzig*References*: <f33ork$l7l$1@smc.vnet.net>*Reply-to*: kuska at informatik.uni-leipzig.de

Hi, just try it ... Plot[] will remove all not-plotable values and Plot[x^(1/3), {x, -2, 2}] show nothing on the negative part of the x-axes and Plot3D[(x + y)^(1/3), {x, -2, 2}, {y, -2, 2}] will be cutted along the x==-y line. So, do nothing and remove the RealOnly package. Regards Jens Helen Read wrote: > Suppose my calculus students want to plot x^(1/3), for say {x,-8,8}. The > problem, of course, is that Mathematica returns complex roots for x<0. > In past versions of Mathematica, we could get the desired real roots > (and plot the function) by loading the package Miscellaneous`RealOnly. I > guess we can still do it that way (and ignore the "obsolete package" > message), but is there a suggested way of doing what we need in 6.0? > > -- > Helen Read > University of Vermont >

**Follow-Ups**:**Re: Re: What to do in v. 6 in place of Miscellaneous`RealOnly***From:*Murray Eisenberg <murray@math.umass.edu>