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>
- Quit versus Clear["Global`*"]