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MathGroup Archive 2001

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Re: Problem in loading own Package

  • To: mathgroup at smc.vnet.net
  • Subject: [mg27198] Re: Problem in loading own Package
  • From: Ossama Kullie <kullie at hrz.uni-kassel.de>
  • Date: Fri, 9 Feb 2001 03:10:47 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com



Dear Roland,

Thank you very mach, that was the Problem and I have now the solution. I
have edit/wrote and saved the package as a Notebook in the file
"Poisson.m" . One must edit/write or save the Packages as a normal text
file. 
 
 Best regard, Ossama

-------------------------------------
Its a bug (or a feature?) if you save a notebook in   menu/ file /
special / package format.
Check your *.m file using a text editor. Probably you will find it
saved  as a comment (* ... *).


> 
> Dear Mathematica users can you help me?
> 
> I have written the folloing  package
> 
> BeginPackage["Poisson`"]
>  Clear[PoissonBracket]
> PoissonBracket::usage = "PoissonBracket[a, b,n] calculates the Piosson
> bracket for tow functions a and b which depend on the variables p, q"
> Begin["`Private`"]
> PoissonBracket[a_, b_, n_] := Block[{pk, n},
>       pk =
>         Simplify[
>           Sum[D[a, q[i]]* D[b,p[i]] - D[a,p[i]] * D[b,q[i]], {i,1,n}]]]
> End[]
> EndPackage[]
> 
>  and I have put it in a file Poisson.m, and  tried all possibilties to
> load the package but it doesnot work!
>  Mathematica has read the file Poisson.m, but the function
PoissonBracket
>  is not created
>   As Example :
>  Needs["Poisson`", "Poisson.m"]
>  give the folloing error
>  Needs::nocont: Context Poisson` was not created when Needs was
>  evaluated.
>  or: <<Poisson`
>      then
>      ?? PoissonBracket
>      Information::notfound: Symbol PoissonBracket not found.
> 
>  or: Get["Poisson.m"]
>    and then
>    ?? PoissonBracket
>    nformation::notfound: Symbol PoissonBracket not found.
> 
>    the folloing information may be usfel to anser my quation
>    $ContextPath
>    Context[Poisson]
>    ?? Poisson
> 
>    this give the Output
> 
>   {"Global`", "System`"}
>   "Global`"
>   "Global`Poisson"
>  the funktion PoissonBracke work very well, when I create it in my
>  Notebook, only in a package doesnot!
>  I cannot find any error, why I cannot load the
>  function PoissonBracket from the pachage? .


-- 
Roland Franzius

  +++ exactly <<n>> lines of this message have value <<FALSE>> +++



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