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MathGroup Archive 2001

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RE: Re: Loading packages within packages

  • To: mathgroup at smc.vnet.net
  • Subject: [mg30286] RE: [mg30276] Re: Loading packages within packages
  • From: "David Park" <djmp at earthlink.net>
  • Date: Sun, 5 Aug 2001 16:18:32 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Oliver,

I think it is because PDF is not in Statistics`NormalDistribution` itself,
but is in Statistics`Common`. So, you should also list that package in your
BeginPackage statement.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/

> From: Oliver Friedrich [mailto:oli.fri at gmx.de]
To: mathgroup at smc.vnet.net
>
> Hallo again,
>
> thanks for your help, my second question (how to write and save a
> package?)
> seems to be answered.
> But there is still my problem with the unevaluated ExternalFunction A.
> My abstract MyPackage package doesn't seem to reflect the error
> that I made,
> because none of you experts did find anything. So I give a real
> example (and
> that is almost the thing my packet should do, even the names).
>
> BeginPackage["TzmSignalTheory`",{"Statistics`NormalDistribution`"}]
>
> DiscreteGaussExcitement::usage:=
> "blabla"
>
> Begin["`Private`"]
>
> DiscreteGaussExcitement[f_,width_,var_:w]:=
> PDF[NormalDistribution[f,width],var]]
>
> End[]
>
> EndPackage[]
>
> So, that's my pain in the neck. If I call this package in application.nb I
> get
>
> In[1]=
> <<TzmSignalTheory`
>
> In[2]=
> DiscreteGaussExcitement[a,b,c]
>
> Out[2]=
> TzmSignalTheory`Private`PDF[NormalDistribution[a,b],c]
>
> Why doesn't it find the definitions for PDF and NormalDistribution ? They
> sure are in this package Statistics`NormalDistribution`, cause it
> works when
> I load that package in application.nb and work directly with PDF
> and Norm...
>
> My second thought was: OK, can't work if PDF appears in
> TzmSignalTheory`context(whatever the reason, it does at all) so my second
> approach was
>
> BeginPackage["TzmSignalTheory`",{"Statistics`NormalDistribution`"}]
>
> DiscreteGaussExcitement::usage:=
> "blabla"
>
> Begin["`Private`"]
>
> DiscreteGaussExcitement[f_,width_,var_:w]:=
> Statistics`NormalDistribution`PDF[Statistics`NormalDistribution`No
> rmalDistri
> bution[f,width],var]]
>
> End[]
>
> EndPackage[]
>
> When I load this package (after quit the kernel and reload, I'm really
> carefully with that topic), the following happens:
>
>
> In[1]=
> <<TzmSignalTheory`
>
> PDF::"shdw":
>     "Symbol \!\(\"PDF\"\) appears in multiple contexts \
> \!\({\"Statistics`NormalDistribution`\", \(\"St\" \\[Ellipsis]
> \"on`\"\)}\);
> \
> definitions in context \!\(\"Statistics`NormalDistribution`\"\) may shadow
> or \
> be shadowed by other definitions."
>
> In[2]=
> DiscreteGaussExcitement[a,b,c]
>
> Out[2]=
> PDF[NormalDistribution[a,b],c]
>
> First that warning after loading the package, but the line Out[2] looks
> nicer to me, but still it is unevaluated, Mathematica can't find that
> bleeding definitions.
> But if I load the Statistics`NormalDistribution`into my application.nb...
>
>
> DiscreteGaussExcitement[a,b,c]
>
> \!\(E\^\(-\(\((\(-a\) + c)\)\^2\/\(2\ b\^2\)\)\)\/\(b\ \@\(2\ \[Pi]\)\)\)
>
> Now it comes along with the correct answer. Loading my Statistics into
> application.nb could be a workaround, but that's an awful solution.
>
> By the way: Thanks for the advice with that AutogeneratedPackage
> option. But
> to me it wasn't easy to find. It isn't documented in the online
> help, is it?
>
> Oliver
>
>



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