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Re: Contexts and DumSave

• To: mathgroup at smc.vnet.net
• Subject: [mg54849] Re: Contexts and DumSave
• From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
• Date: Fri, 4 Mar 2005 05:07:45 -0500 (EST)
• Organization: Uni Leipzig
• References: <d060us$kqa$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

and

DumpSave["mypack.mx","mypack`"]

instead of
DumpSave["mypack.mx",expr]

does not help ?
Regards
  Jens

"Geronimo" <kalymereauNOSP at Myahoo.fr> schrieb im Newsbeitrag 
news:d060us$kqa$1 at smc.vnet.net...
> Hi
>
> I have a package mypack.m in which I compute a time-consuming expression:
>
> BeginPackage["mypack`"]
>
> expr::usage="stuff"
>
> Begin["`Private`"]
>
> expr = (complicated)
>
> End[]
>
> EndPackage[]
>
> So I am considering to save the expression with a 
> DumpSave["mypack.mx",expr]
> inside the package. Thus the full name of the expression is mypack`expr
>
> Then in a notebook I want to load the expression
> << "mypack`"
>
> If the mypack.mx file does not exists, then mypack.m is called and the
> expression is computed and exported. $ContextPath is updated with mypack`
>
> However if mypack.mx does exist, then mypack.m is not called (OK), the
> expression is loaded from the .mx file and I can quickly have it with
> mypack`expr. But in this case $ContextPath is not changed, so the short
> name expr is not recognized.
>
> In other words, expr only exists within context mypack`, but the <<
> instruction does not load the appropriate context when the .m file is not
> called.
>
> Thus my question is: when the .mx file is created within a package, how 
> can
> I get the expressions inside without typing their full name ?
>
> I could hack $ContextPath but I guess this is not the correct way to do.
>
> I don't want to compute and DumpSave the expression within the global`
> context, which is an obvious solution to my problem.
>
> Many thanks.
>
> Geronimo
>