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?) |