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Re: Creating a simple state inspector for Mathematica

• To: mathgroup at smc.vnet.net
• Subject: [mg111871] Re: Creating a simple state inspector for Mathematica
• From: telefunkenvf14 <rgorka at gmail.com>
• Date: Mon, 16 Aug 2010 05:54:57 -0400 (EDT)
• References: <i45rgt$g5a$1@smc.vnet.net> <i48jlj$e8b$1@smc.vnet.net>

On Aug 15, 6:39 am, magma <mader... at gmail.com> wrote:
> On Aug 14, 12:35 pm, "J. McKenzie Alexander" <ja... at lse.ac.uk> wrote:> Hi=
,
>
> > I'm trying to create a simple "state inspector" for Mathematica. Ideall=
y,
> > I'd like to have a dynamically updated list of all the symbols in Globa=
l`=
> ,
> >  with the option of displaying their values, and the ability to Clear=
 o=
>
> r Remove symbols by clicking on a button. Now, I've managed to put togeth=
er=
>  something which *almost* does what I want, but it has a slight bug. Wh=
at's=
>  the bug? You can Clear a symbol by clicking on the button named "Clear=
", b=
> ut clicking on the button named "Remove" generates an error. I don't unde=
rs=
> tand why.

Very interesting... Humble request: Can someone from WRI clear this up
with a brief comment? (or ClearAll this up, if you'd prefer) Haha...
me punny.

-RG

> the command Remove is very nasty!
> I would not recommend anybody using it in a program (that is a
> sequence of steps running ).
> One should only use it directly, that is typing it by hand, if at all.
> The reason is that when you remove a symbol (say x), a sort of shadow
> or ghost lingers in memory and is called Removed[x] and all
> definitions (in Set, SetDelayed and elsewhere) are modified in such a
> way that occurrences of x are replaced with Removed[x], practically
> making them unusable by Mathematica again, even if you give x a value aga=
in.
> So, I would simply NOT use Remove in your inspector.
> Clear or ClearAll is enough for most reasonable things.