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MathGroup Archive 2006

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Re: Can't Remove[] variable "K"? (Really strange behavior . . . )

  • To: mathgroup at
  • Subject: [mg69162] Re: [mg69131] Can't Remove[] variable "K"? (Really strange behavior . . . )
  • From: "Chris Chiasson" <chris at>
  • Date: Thu, 31 Aug 2006 04:39:43 -0400 (EDT)
  • References: <>
  • Sender: owner-wri-mathgroup at

K is probably in a different context than Global. Execute Context[K].

On 8/30/06, AES <siegman at> wrote:
> For years I've started every notebook with the input line
>    x; Remove["Global`*"];
> so every calculation will start more or less "fresh".  Recently a
> calculation exhibited weird behavior involving a variable "K", which
> didn't seem to get removed or cleared by Remove[].   I eventually boiled
> this down to a simple free-standing 5 Input cell notebook as follows:
>    x; Remove["Global`*"];
>    K=0.6;
>    Remove["Global`*"];
>          Remove::"rmnsm"
>          There are no  symbols matching "Global`*".   More?
>    K
>          0.6
>    ??K
>          K is a default generic name for a summation index in a symbolic
>          sum.
>          K = 0.6
> Notes:
> 1)  This is on a Mac iBook G4, OS 10.3.9, Mathematica
> 2)  Each single-indent line is an Input cell; double-indent lines are
> Output cells.  Behavior repeats the same after re-typing all the cells
> into a fresh notebook; after quitting and re-starting Mathematica; after
> shutting down and restarting the Mac.
> 3)  I appreciate that user variables preferably start with lower case --
> but other single-cap-letter symbol names work OK, and doing Help on "K"
> brings up nothing special associated with K by itself.
> [And by the way, how can one select a sequence of cells in a notebook
> and copy all their contents -- including error msgs -- to paste in as
> above, without having to retype most of the stuff?)


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