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MathGroup Archive 2000

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A simple problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24802] A simple problem
  • From: Francisco Gutierrez <rpena at impsat.net.co>
  • Date: Sun, 13 Aug 2000 03:16:41 -0400 (EDT)
  • References: <200008090631.CAA00832@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

This is a possibly trivial problem, but it may be relevant for many
Mathematica users.
Suppose I have a function, I apply it to my data and I tag the result, eg:
example= function[data_]
I would like to use the tag without having to evaluate the function once and
again.  Of course, this is possible within each Mathematica session.  But I
would want to save the notebook, start a new session and then use the tag,
without having to run the function again (in my specific case, each time I
run it costs more than 2 hours of computer time).  Is there a way?
Thanks,
Francisco Gutierrez



----- Original Message -----
From: David Park <djmp at earthlink.net>
To: mathgroup at smc.vnet.net
Subject: [mg24802] [mg24733] RE: [mg24673] Package naming


> Hi Jack,
>
> I know that there are different practices, but this is what I like to do.
>
> I like my packages to behave just like the standard Mathematica packages.
> WRI has provided a simple way to do this.
>
> I put all my packages in AddOns/ExtraPackages and then create folders
there
> that parallel the ones that are in AddOns/StandardPackages. You can also
> create special folders there for special topics. For example, I have a
> folder named DifferentialGeometry where I put packages related to that
> subject. This way, your packages, or any packages you get from others who
> follow this scheme will behave just like standard packages, but will be
kept
> separate from the standard packages. Mathematica automatically looks in
> AddOns/ExtraPackages.
>
> Suppose that you find that your package would best be grouped with
Calculus`
> packages. Then create a folder named Calculus in AddOns/ExtraPackages.
Place
> the notebook that creates the package there. The name of this notebook
will
> be PiecewiseContinuous.nb. If you have made all the cells initialization
> cells, and choosen the Autosave feature, then when you save it, a package
> file with the name PiecewiseContinuous.m will also be created there.
Anytime
> you update the notebook, the package will be updated.
>
> Here is the slightly tricky part, which is not well documented (as far as
I
> could find). Write your BeginPackage statement this way:
>
> BeginPackage["Calculus`PiecewiseContinuous"]
>
> In other words you have to give the path from ExtraPackages on down.
>
> Then it should work just like the standard packages.
>
> David Park
> djmp at earthlink.net
> http://home.earthlink.net/~djmp/
>
> > -----Original Message-----
> > From: Jack Goldberg [mailto:jackgold at math.lsa.umich.edu]
To: mathgroup at smc.vnet.net
> To: mathgroup at smc.vnet.net
> >
> > Hi once again,
> >
> > I need some help.
> >
> > I have just completed designing a package that tries to incorporate
> > piecewise continuous functions seamlessly into Mathematica.  Naturally,
I
> > entitle the package  PiecewiseContinuous.  So, I want the user
> > to be able to call this package by
> >
> > Needs["PiecewiseContinuous`"]
> >
> > or
> >
> > <<PiecewiseContinuous`
> >
> > just the way I can call  <<Algebra`    or    Needs["Collatz`"]  to get
> > these to Packages to load.  (I know the difference between <<  and
Needs;
> > I use them both here to illustrate my problem.)
> >
> > Now the problem ...
> >
> > What do I put as the argument of BeginPackage[?] and where should the
> > package be stored so that the call to load it is not too different from
> > <<PieceWiseContinuous` ? I have a feeling these are related questions
and
> > the answer hinges on ContextPaths.   I might
> > add that none of the books I have consulted directly address this issue.
> > (I have a rather large library of Mathematica books by the way.)
> > For instance,
> > Maeder gives a host of examples in his book Programming in Mathematica.
> > Here is one
> >
> > BeginPackage["RandomWalk`"]
> > ...
> >
> > EndPackage[]
> >
> > but does not hint at where and how to store this package so that it can
> > be loaded with the call  <<RandomWalk` .
> >
> > My best quess is this:  If the user (say me) stores the package in a
> > folder `mypackages,  then the correct call to load PiecewiseContinuous
is
> > Needs["mypackages`PiecewiseContinuous`"]  since this will tell
> > Mathematica where
> > to look for this function.  Is this right?
> >
> > Thanks all.  Learning Mathematica on my own tends to leave me
> > with large gaps in
> > my knowledge- or at least in my confidence.
> >
> >
> > Jacl
> >
> >
> >
> >
> >
> >
> >
>
>
>



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