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Groups > comp.soft-sys.math.mathematica > #1523

Re: package construction

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"Sjoerd C. de Vries" <sjoerd.c.devr...@gmail.com> wrote:
> This is from tutorial/SettingUpMathematicaPackages. It doesn't look
> that complicated to me...
>
> BeginPackage["Collatz`"]
>
> Collatz::usage =
>         "Collatz[n] gives a list of the iterates in the 3n+1 problem,
>         starting from n. The conjecture is that this sequence always
>         terminates."
>
> Begin["`Private`"]
>
> Collatz[1] := {1}
> Collatz[n_Integer]  := Prepend[Collatz[3 n + 1], n] /; OddQ[n] && n >
> 0
> Collatz[n_Integer] := Prepend[Collatz[n/2], n] /; EvenQ[n] && n > 0
>
> End[ ]
> EndPackage[ ]

The key thing that should be added here is that one must create (= use
in any way) all the symbols that must be accessible outside of the
package *before* Begin["`Private`"]. In this case they will be in the
Collatz` context (in the example above) and they will be in the
$ContextPath after loading of the package.

Alexey

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package construction Jack L Goldberg 1 <jackgold@umich.edu> - 2011-04-05 10:45 +0000
  Re: package construction "Sjoerd C. de Vries" <sjoerd.c.devries@gmail.com> - 2011-04-06 09:12 +0000
    Re: package construction Alexey <lehin.p@gmail.com> - 2011-04-07 12:06 +0000
  Re: package construction "Nasser M. Abbasi" <nma@12000.org> - 2011-04-06 09:14 +0000

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