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MathGroup Archive 2000

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Re: 2nd arg to BeginPackage

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24770] Re: 2nd arg to BeginPackage
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 10 Aug 2000 00:31:51 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <8mr1c5$1mj@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

since the Statistic contex does not introduce any symbols.
You must give the correct context that add symbold for
CDF[] this is "Statistics`Common`DistributionsCommon`"
for NormalDistribution[] this is "Statistics`NormalDistribution`"

BeginPackage[
    "TestPkg`", {"Statistics`Common`DistributionsCommon`", 
      "Statistics`NormalDistribution`"}];

ff::usage = "Some function that uses CDF."

Begin["`Private`"];

ff[a_] := CDF[NormalDistribution[0, 1], a]
End[];   (*Private context*)

EndPackage[];

and all works fine

?? ff

Some function that uses CDF.


ff[TestPkg`Private`a_] := CDF[NormalDistribution[0, 1],
TestPkg`Private`a]

Regards
  Jens


Daniel Reeves wrote:
> 
> My first question is, there seems to be a discrepancy between the
> documentation for BeginPackage:
>   BeginPackage["Package`", {"Needed1`", "Needed2`", ...}]
> vs how standard packages use it:
>   BeginPackage["Package`", "Needed1`", "Needed2`", ...]
> 
> My next question is, why doesn't either form do what I expect here:
> 
> BeginPackage["TestPkg`", "Statistics`"];
> ff::usage = "Some function that uses CDF."
> Begin["`Private`"];
> ff[a_] := CDF[NormalDistribution[0,1], a]
> End[];   (* Private context *)
> EndPackage[];
> 
> In the definition of ff, it thinks the context for CDF (and
> NormalDistr) is TestPkg`Private` instead of Statistics`...
> 
> How can I avoid spelling out the contexts for things like CDF?
> 
> Thanks a lot,
> Daniel Reeves
>


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