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Using Notebooks to write packages?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg66852] Using Notebooks to write packages?
*From*: "Steven T. Hatton" <hattons at globalsymmetry.com>
*Date*: Thu, 1 Jun 2006 06:55:33 -0400 (EDT)
*Sender*: owner-wri-mathgroup at wolfram.com
I have encountered a problem while working with packages in which a package
needed when loading the one I'm creating will produce a shadow warning.
For example if I have
BeginPackage["Drawing`", {"Graphics`Arrow`"}]
DrawGrid::usage = "DrawGrid[\[Theta],X,Y,origin, options]";
....
Begin["`Private`"]
....
DrawGrid[theta_, X_, Y_, o_, opts___?OptionQ] :=
Module[{dx = UR[theta], dy = UR[theta + Pi/2], Dx, mXColor, mYColor},
mXColor = xColor /. {opts} /. Options[DrawGrid];
mYColor = yColor /. {opts} /. Options[DrawGrid];
Dx = {o, X dx};
Dy = {o, Y dy};
{{mXColor
,{Dashing[{0.01}]
, Table[Line[{Dx[[1]] + #, Dx[[2]] + #} &@(y dy)], {y, 0, Y}]
}
, Arrow[o, dx, HeadScaling -> Relative]
}
,{mYColor
,{Dashing[{0.01}]
,Table[Line[{Dy[[1]] + #, Dy[[2]] + #} &@(x dx)], {x, 0, X}]
}
,Arrow[o, dy, HeadScaling -> Relative]
}
}
]
End[]
EndPackage[]
I get a shadow warning saying that Arrow and HeadScaling are in multiple
contexts; global and Graphics`Arrow`. I checked before loading the
package, and they were not present in global scope. I tried creating a
very minimal package along the same lines, and using Graphics`Arrow`, and I
didn't get the warning. I then took all the code I had written and rewrote
it using Emacs, and saved it as a .m file. No more warning.
This is on Linux. Has anybody else encountered this kind of problem? I'm
inclined to believe the problem has to do with the fact that I created the
package using the Notebook front end. It doesn't happen every time I
create a package using the front end, but I have not identified any kind of
pattern.
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