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Re: Problem with context creation in packages

  • To: mathgroup at
  • Subject: [mg30467] Re: Problem with context creation in packages
  • From: "Allan Hayes" <hay at>
  • Date: Thu, 23 Aug 2001 02:15:32 -0400 (EDT)
  • References: <9lvgum$4o3$>
  • Sender: owner-wri-mathgroup at


The local name of the package file:
and the package context:
should be the same

Allan Hayes
Mathematica Training and Consulting
Leicester UK
hay at
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565

"Emilio Martin-Serrano Sobrino" <emilio.martin at> wrote in message
news:9lvgum$4o3$1 at
> Hi:
> I am trying to load two packages with the following headings:
> 1 ->
> BeginPackage["Islm`EquilibriumStageTrasitionISLM`","Utilities`ISLMmodel`"]
> 2 ->  BeginPackage["Islm`ISLMFunctions`","Utilities`ISLMmodel`","Islm`
> EquilibriumStageTransitionsISLM`"].
> When I invoke these packages within a notebook I get this
> In[1] :=   Needs["Islm`EquilibriumStageTransitionISLM`"]
> Out[1]:= Needs::nocont: Context Islm`EquilibriumStageTransitionISLM` was
> created when Needs was evaluated.
> In[2]:=    Needs["Islm`ISLMFunctions`"]
> Out[2]:= Needs::nocont: Context Islm`EquilibriumStageTransitionISLM` was
> created when Needs was evaluated.
> However, if I execute
> In[6]:=?Islm`EquilibriumStageTrasitionISLM`*
> I can see that all the symbols in the package have been created, (and the
> same for In[7]:= ?Islm`ISLMFunctions`*    )
> And, If I execute
> In[8]:= $ContextPath
> Out[8]:=
> `, ............}
> Which tells me the target context names have been put in the ContextPath.
> (Why so, if the context has not been created?)
> Then, I check all the functions and symbols in these packages and all them
> (but two) seem to work perfectly. The two symbols that do not work are in
> the package  *Islm`ISLMFunctions*  and they use two symbols imported from
> the package *Islm`EquilibriumStageTrasitionISLM* (remember, it is the one
> whose context was no created). And this seems to be the reason why these
> symbols do not work, since the imported symbols from the package
> *Islm`EquilibriumStageTrasitionISLM* are re-declared as private in the
> package *Islm`ISLMFunctions*.  I think this re-declaration `informs`  that
> the imported symbol has not been found  because the corresponding context
> does not actually exist.
> The two packages *Islm`EquilibriumStageTrasitionISLM`* and
> *Islm`ISLMFunctions`* use symbols and functions in equivalent syntactical
> positions to the one that is re-declared, but these symbols that work ok
> come from the other packages, and everything goes OK.
> Of course, I did not get any other error message o warnings on syntactical
> problems.
> Could anyone give a clue on the apparent contradiction.
> Emilio Martin-Serrano
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