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MathGroup Archive 1997

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Forgetfullness

  • To: mathgroup at smc.vnet.net
  • Subject: [mg7933] Forgetfullness
  • From: Alex Tabarrok <00attabarrok at bsu.edu.bsu.edu>
  • Date: Wed, 23 Jul 1997 15:46:11 -0400
  • Organization: Ball State University
  • Sender: owner-wri-mathgroup at wolfram.com

Michael,

         David Wagner develops a very nice anti-shadowing package in his
book "Power Programming with Mathematica: the Kernel."  The package
automatically prevents the very annoying problem you discuss.  



On Sat, 5 Jul 1997, Michael wrote:

> 
> Is there a way in Mathematica to recover from forgetting to include a 
> package?  For example, I type:
> 
> ImplicitPlot[x^2+y^2==1,{x,-1,1}]
> 
> and Mathematica returns the same thing back.  So I go, "Ooops, I forgot 
> to load a package."  So I type:
> 
> <<Graphics`ImplicitPlot`
> 
> but instead of being all nice and good this gives me errors like:
> 
> Set::write:Tag ImplicitPlot in Options[ImplicitPlot] is Protected.
> 
> Clear[ImplicitPlot] does not help.  Even after trying to load


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