Re: Postponing loading of Package
- To: mathgroup at smc.vnet.net
- Subject: [mg36673] Re: Postponing loading of Package
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Wed, 18 Sep 2002 02:10:10 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <alubet$no8$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
BeginPackage[ "OtherPackage`" ]
BigVariable::usage="example"
Begin["`Private`"]
BigVariable=Table[x y,{x,1000},{y,1000}]
End[ ]
EndPackage[ ]
Print["Loading ..."];
and
BeginPackage[ "ThisPackage`" ]
function::usage="example"
Begin["`Private`"]
function[x_]:=Module[{y},
y=If[x>1000,
Needs["OtherPackage`"];
OtherPackage`BigVariable[[x]],
x]
]
End[ ]
EndPackage[ ]
should do that.
Regards
Jens
ng wrote:
>
> 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