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MathGroup Archive 2000

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Re: Clear or remove definitions including Subscripts

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23143] Re: Clear or remove definitions including Subscripts
  • From: adam_smith at my-deja.com
  • Date: Thu, 20 Apr 2000 03:21:02 -0400 (EDT)
  • References: <8djl1m$7j6@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Sanchez,

With subscripted variables the trick is to "unassign" the variable with
the form

Subscript[a, 11] = .

Note that you need the period "." after the equal sign "=" .  There
must be some subtle differences between Clear[] and "=." but I do not
know them.


In article <8djl1m$7j6 at smc.vnet.net>,
  "SANCHEZ DE LEON, Guillermo" <gsl at fab.enusa.es> wrote:
> Dear friends,
>
> If I write:
>
> In[1]:= Subscript[a, 11];
> In[2]:= Subscript[a, 12];
>
> Q1: How I can Clear or Remove the previous definitions?.
> Q2: Is it posible to clear at the same time all definitions with
pattern:
> Subscript[a, i] (* i=1,2,..*)
>
> I wish to avoid using Notation Package
>
> I have tested:
>
> In[3]: Clear[Subscript[a, 11]]
> Message: Clear:: "ssym": a_11 is not a symbol or a string
>
> In[4]: Clear["\!\(a\_11\)"]
>
> But they don`t work
>
>


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