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MathGroup Archive 2007

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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
> 


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