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MathGroup Archive 2000

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RE: Contexts and Naming of Things

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25739] RE: [mg25691] Contexts and Naming of Things
  • From: "David Park" <djmp at earthlink.net>
  • Date: Sat, 21 Oct 2000 14:42:49 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Mike,

{foo[x, HSSV`cavity`Private`bar], foo[x, HSSV`cavity`Private`nebbish]}
{1, 2}

But you probably want to do your package this way:

BeginPackage["HSSV`cavity`"]
foo::usage = "now is the time...";
bar::usage = "A control parameter for foo";
nebbish::usage = "A control parameter for foo";
Begin["`Private`"]
foo[x_, y_] := 1 /; y === bar;
foo[x_, y_] := 2 /; y === nebbish;
End[]
EndPackage[]

{foo[x, bar], foo[x, nebbish]}
{1, 2}

Or you could also do this:

BeginPackage["HSSV`cavity`"]
foo::usage = "now is the time...";
Begin["`Private`"]
foo[x_, y_] := 1 /; y === Global`bar;
foo[x_, y_] := 2 /; y === Global`nebbish;
End[]
EndPackage[]

{foo[x, bar], foo[x, nebbish]}
{1, 2}


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

> -----Original Message-----
> From: Mike Yukish [mailto:may106 at psu.edu]
To: mathgroup at smc.vnet.net

> I have the following code which does not work as I had hoped. I first
> declare a function in a package...
> 
> BeginPackage["HSSV`cavity`"]
> foo::usage = "now is the time..."
> Begin["`Private`"]
> bar;
> nebbish;
> foo[x_, y_] := 1 /; y === bar;
> foo[x_, y_] := 2 /; y === nebbish;
> End[]
> EndPackage[]
> 
> And then try to run the following simple commands...
> 
> foo[1, bar]
> foo[1, cavity`bar]
> foo[1, HSSV`cavity`bar]
> 
> I had thought that the first one would have given me the correct answer,
> as it works OK when I do not embed the function definition in a package.
> The others were desperate second efforts that also failed. What am I
> missing here?
> 
> 
> 
> 
> 
> 


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