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Re: I can not find all the contexts through the command "Contexts[]".

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126694] Re: I can not find all the contexts through the command "Contexts[]".
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Thu, 31 May 2012 02:49:59 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <jq4kor$ftv$1@smc.vnet.net>

On 2012.05.30. 10:12, ichi wrote:
> Hi,
> I am using the Mathematica version4.
> According to the help browser, the command "Contexts[]" must have shown
> a context list that includes all the contexts.
> But all the contexts are not shown in it.
>
> For example, after checking by running "$Context" that has shown "Global`", "Global`" could not be found in the list that was made by "Contexts[]" .
> What should I do?
>


If there are no symbols that are part of the Global` context, then the 
context is considered not to exist, and Contexts[] will not return it.

In[]:= Quit (* restart kernel *)

In[]:= MemberQ[Contexts[], "Global`"]
Out[]= False

First create a symbol:

In[]:= sym
Out[]= sym

Then try again:

In[]:= MemberQ[Contexts[], "Global`"]
Out[]= True

-- 
Szabolcs Horvát
Visit Mathematica.SE:  http://mathematica.stackexchange.com/



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