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Re: Trouble Loading Packages...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg128327] Re: Trouble Loading Packages...
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Sun, 7 Oct 2012 01:31:35 -0400 (EDT)
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One little addendum to David's excellent explanation of user-created package placement.

Suppose you have just one package file, myApp.m, to go into $UserBaseDirectory/Applications subfolder myApp. And suppose that package begins with:

  BeginPackage["MyApp`"];

Then instead of using an init.m within a Kernel subfolder of the myApp folder, you may load the package with

  <<myApp`myApp`

or the equivalent Needs statement.


On Oct 6, 2012, at 1:47 AM, djmpark <djmpark at comcast.net> wrote:

> Because so many people don't know where to put packages, or don't want to
> put them in the place designed for them.
>
> Evaluate $UserBaseDirectory in a Mathematica session. In that directory you
> will find a pre-established Applications folder. Put your work there. This
> is your private Applications folder.
>
> Say you are doing extended work on TopicX. Create a TopicX folder in your
> private Applications folder. You can create subsidiary folders that contain
> your work and organize your notebooks on this topic.
>
> Now make the BeginPackage statement in your package (which has the name
> cellNeighbours.m and is placed in the TopicX folder):
>
> BeginPackage["TopicX`cellNeighbours`"]
>
> Now you can load the package from anywhere by using:
>
> << TopicX`cellNeighbours`
>
> You could have more than one package in the TopicX folder.
>
> WRI has implemented a feature such that if you load the package with the
> following statement (omitting the package context)
>
> << TopicX`
>
> then Mathematica looks for an init.m file within a Kernel folder within the
> TopicX folder and evaluates all the Initiation cells in the file. So if you
> had a second package, say Package2, you could include the statements:
>
> Get["TopicX`cellNeighbours`"]
> Get["TopicX`Package2`"]
>
> in the init.m file.
>
> You could also create FrontEnd/Palettes and FrontEnd/StyleSheets folders
> within TopicX and then any palettes or style sheets associated with the
> project would appear on your Mathematica menus. If you had more than one
> palette or style sheet you could create the structure
> FrontEnd/Palettes/TopicX/palettes... Then all the palettes associated with
> TopicX would be grouped together within one entry on the Mathematica
> Palettes menu.
>
> And now your packages will load from anywhere because Mathematica
> automatically looks in the private Applications folders for packages,
> palettes, style sheets and documentation (if you create that.)
>
>
> David Park
> djmpark at comcast.net
> http://home.comcast.net/~djmpark/index.html
>
>
>
> From: Richard Palmer [mailto:rhpalmer at gmail.com]
>
>
> ...using the latest version of Mathematica on a 64 bit windows machine.
>
> Here is the relevant code
>
>
> In[1]:= Directory[]
> Out[1]= "C:\\Users\\Richard\\Documents"
>
> FileNames[{"*.m"}]
> {"cellNeighbours.m", "myS.m"}
>
> FileExistsQ["cellNeighbours.m"]
> True
>
> In[5]:= FindFile["cellNeighbours.m"]
> Out[5]= "C:\\Users\\Richard\\Documents\\cellNeighbours.m"
> In[6]:= << cellNeighbours`
> In[7]:= ?cellNeighbours
> During evaluation of In[7]:= Information::notfound: Symbol cellNeighbours
> not found. >>
>
> Needs["cellNeighbours`"]
> Needs::nocont: Context cellNeighbours` was not created when Needs was
> evaluated. >>
>
>
> Same thing happens with the myS package.  Why can't if find and load the
> package?
>
> 
--------------------------------------------------------------------------

>
> This is the cellNeighbours Package
>
> BeginPackage["cellNeighbours`"];
>
> cellNeighbours::usage =
>  "cellNeighbours[r,c] sets up a function to quickly return a list of the n
> \ nearest neighbours of a given cell in an r\[ScriptX]c matrix. By deafult,
> a \ toroidal distance matrix is assumed."; neighbourhoodList::usage "neighbourhoodList[rI,cI,k] returns a list of the k nearest cells to \
> \!\(\*SubscriptBox[\(cell\), \(r1, c1\)]\) in an r\[ScriptX]c matrix. By \
> deafult, a toroidal distance matrix is assumed";
>
> toroidalDistance::usage 
>  "teroidalDistance[{r1,c1},{r2.c2}] returns a \!\(\*
>  StyleBox[\"wrap\",\nFontSlant->\"Italic\"]\)\!\(\*
>  StyleBox[\" \",\nFontSlant->\"Italic\"]\)\!\(\*
>  StyleBox[\"around\",\nFontSlant->\"Italic\"]\)\!\(\*
>  StyleBox[\" \",\nFontSlant->\"Italic\"]\)distance between two points";
>
> distancefn::usage = "distance[a,b,len] computes a \!\(\*
>  StyleBox[\"wrap\",\nFontSlant->\"Italic\"]\)\!\(\*
>  StyleBox[\" \",\nFontSlant->\"Italic\"]\)\!\(\*
>  StyleBox[\"around\",\nFontSlant->\"Italic\"]\) distance from a to b
> between \ two cells on the same row or column.  \!\(\*
>  StyleBox[\"len\",\nFontSlant->\"Italic\"]\) is the length of the \
> row/column.";
>
>
> Begin["Private`"];
> rows = -1;
> cols = -1;
> cellNeighbourhood = -1;
> cellIndices = -1;
> cellNeighbours[r_Integer, c_Integer] := Module[{},
>    rows = r;
>    cols = c;
>    cellIndices = Table[{i, j}, {i, 1, r}, {j, 1, c}];
>    cellNeighbourhood = Nearest[Flatten[cellIndices, 1]
>        DistanceFunction -> toroidalDistance]] /; r > 1 && c > 1; =
distancefn
> =
>  Compile[{{a, _Integer}, {b, _Integer}, {len, _Integer}},
>   Module[{mn, mx, result},
>    If[a == b, Return[0]];
>    mx = Max[a, b];
>    mn = Min[a, b];
>    result = Min[mx - mn, mn + len - mx];
>    If[result < 0, Print[{"distance error", a, b, len, result}]];
>    Return[result]]];
> toroidalDistance[p1_, p2_] :=
>  Module[{r, c}, r = distancefn[First[p1], First[p2], rows];
>   c = distancefn[Last[p1], Last[p2], cols]; r^2 + c^2];
> neighbourhoodList[r_, c_, n_] :=
>  cellNeighbourhood[{r, c}, n];
> End[];
> EndPackage[];
>
> --
> Richard Palmer
>
> Home                            941 412 8828
> Cell                               508 982-7266
>
>

---
Murray Eisenberg                                     =
murray at math.umass.edu
Mathematics & Statistics Dept.      
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                  413 545-2859 (W)
710 North Pleasant Street                      fax   413 545-1801
Amherst, MA 01003-9305








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