Re: Quit versus Clear["Global`*"]

*To*: mathgroup at smc.vnet.net*Subject*: [mg121244] Re: Quit versus Clear["Global`*"]*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Tue, 6 Sep 2011 03:55:45 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201109031205.IAA05310@smc.vnet.net> <j3u7r6$a88$1@smc.vnet.net> <201109040812.EAA14914@smc.vnet.net> <201109042205.SAA21490@smc.vnet.net> <op.v1bdvyo7tgfoz2@bobbys-imac.local>*Reply-to*: murray at math.umass.edu

I never recommended use of Remove! In fact, if Clear or ClearAll or ClearAttributes doesn't do what I want, then typically I restart the kernel. On 9/4/11 10:44 PM, DrMajorBob wrote: > Your experiment makes Remove look useful (possibly), but here's one that > does not: > > ClearAll[f] > f[x_] := Plot[x, {x, 0, 1}] SetAttributes[f, Listable] > Remove[x] > ?? f > > Remove[x] cripples f without mentioning it, which I'd call a very ugly > side-effect. > > Bobby > > On Sun, 04 Sep 2011 17:05:26 -0500, Murray Eisenberg > <murray at math.umass.edu> wrote: > >> Try the following little three-part experiment. In each part, the last >> step tells you what Mathematica now knows about the symbol f. >> >> f[x_] := Plot[x, {x, 0, 1}] >> SetAttributes[f, Listable] >> Clear[f] >> ??f >> >> f[x_] := Plot[x, {x, 0, 1}] >> SetAttributes[f, Listable] >> ClearAll[f] >> ??f >> >> f[x_] := Plot[x, {x, 0, 1}] >> SetAttributes[f, Listable] >> Remove[f] >> ??f >> >> On 9/4/11 4:12 AM, AES wrote: >>> In article<j3u7r6$a88$1 at smc.vnet.net>, >>> Murray Eisenberg<murray at math.umass.edu> wrote: >>> >>>> First, Clear, whether for a single object or an entire list of objects, >>>> does not remove their Attributes, e.g., just their values. You might >>>> want ClearAll instead. >>> >>> And how do either of those differ from Remove? >>> >> > > -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305

**References**:**Quit versus Clear["Global`*"]***From:*Themis Matsoukas <tmatsoukas@me.com>

**Re: Quit versus Clear["Global`*"]***From:*AES <siegman@stanford.edu>

**Re: Quit versus Clear["Global`*"]***From:*Murray Eisenberg <murray@math.umass.edu>