Re: Postponing loading of Package

*To*: mathgroup at smc.vnet.net*Subject*: [mg36652] Re: Postponing loading of Package*From*: "John Jowett" <John.Jowett at cern.ch>*Date*: Wed, 18 Sep 2002 02:09:26 -0400 (EDT)*Organization*: CERN*References*: <alubet$no8$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hello, Dynamic programming might help: replace the line defining BigVariable with BigVariable:=BigVariable=Table[x y,{x,1000},{y,1000}] Then the table will not be calculated unless it is needed. (See the section on "Functions that Remember Values They Have Found", 2.4.9 in the Mathematica Book). John Jowett "ng" <georgakopoulos at mindspring.com> wrote in message news:alubet$no8$1 at smc.vnet.net... > I wrote a package (call it "ThisPackage`") that uses > DeclarePackage["OtherPackage`", {"BigVariable"} ]. The idea was to prevent > the loading of a large file in routine cases. However, when ThisPackage` > defines its functions, inside the Private` area, it includes a conditional > call to BigVariable. It turns out that OtherPackage is loaded when that > function is defined. I was wondering if there is a way to avoid this. > Roughly speaking, here is the setting: > > BeginPackage[ "OtherPackage`" ] > BigVariable::usage="example > Begin[Private`] > BigVariable=Table[x y,{x,1000},{y,1000}] > End[ ] > EndPackage[ ] > > BeginPackage[ "ThisPackage`" ] > function::usage="example > Begin[Private`] > function[x_]:=Module[{y}, > y=If[x>1000,BigVariable[[x]],x] ] > End[ ] > EndPackage[ ] > > > I don't want OtherPakage to be loaded unless function[x] is called with > x>1000 but it loads when function is defined. Any ideas? > > > Thanks! > > Nicholas > > > > >