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MathGroup Archive 2007

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Re: What to do in v. 6 in place of

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76867] Re: What to do in v. 6 in place of
  • From: dimitris <dimmechan at yahoo.com>
  • Date: Tue, 29 May 2007 04:52:10 -0400 (EDT)
  • References: <f3bh1e$37g$1@smc.vnet.net><f3doco$flg$1@smc.vnet.net>

Or simply turn off the message in advance for your class!

Dimitris

 /  Helen Read       :
> Bob Hanlon wrote:
> > This works for simple cases such as your examples.
> >
> > Clear[realPlot];
> > realPlot[expr_,
> >    {x_Symbol, xmin_?NumericQ, xmax_?NumericQ},
> >    opts___] := Module[{d, e, f, y},
> >    e = Flatten@{expr};
> >    d = (Denominator@PowerExpand@Log[x, #] & /@ e);
> >    f = y /. (ToRules@
> >          Reduce[y^#[[2]] == PowerExpand[#[[1]]^#[[2]]],
> >           y, Reals] & /@ Thread[{e, d}]);
> >    Plot[f, {x, xmin, xmax}, opts]];
> >
> > Grid[{{realPlot[x^(1/3), {x, -8, 8}],
> >    realPlot[x^(3/5), {x, -8, 8}]},
> >   {realPlot[{x^(1/3), x^(3/5)}, {x, -8, 8}]}}]
>
> This completely misses the point, which is to make it easy for beginning
> calculus students to plot functions such as x^(1/3) for negative x.
> There is no way they could follow what you have written, let alone
> reproduce it themselves.
>
> Probably the best solution at this point is to simply use the old
> Miscellaneous`RealOnly` package when this comes up in class, and just
> ignore the "obsolete package" message.
>
> --
> Helen Read
> University of Vermont



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