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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: [mg76636] Re: [mg76579] What to do in v. 6 in place of Miscellaneous`RealOnly
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 25 May 2007 06:26:48 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

Plot[y /. Solve[y^3 == x, y], {x, -8, 8}]

Plot[Sign[x] Abs[x^(1/3)], {x, -8, 8}]


Bob Hanlon

---- Helen Read <read at math.uvm.edu> 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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