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MathGroup Archive 2006

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69140] Re: Can't Remove[] variable "K"? (Really strange behavior . . . )
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 31 Aug 2006 04:38:46 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <ed3shk$s6m$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

and looking for
?K
you see that there is already a K in the System` 
context, probably by
an error and you have to remove Remove["System`K"]

Regards
  Jens



"AES" <siegman at stanford.edu> schrieb im 
Newsbeitrag news:ed3shk$s6m$1 at smc.vnet.net...
| 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 5.1.0.0.
|
| 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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