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Saving Packages (was: Re: importing nb files)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg86775] Saving Packages (was: Re: importing nb files)
  • From: "alexxx.magni at gmail.com" <alexxx.magni at gmail.com>
  • Date: Thu, 20 Mar 2008 02:58:16 -0500 (EST)
  • References: <fro3a6$i8l$1@smc.vnet.net> <frqpnm$505$1@smc.vnet.net>

Update:

Starting by creating a new package window, the a=2 definition
generates a .m file containing:

(* ::Package:: *)

a=2

so: without the (* ::Input:: *) line, and with the definition not
commented.

BUT - this remains a problem, if one doesnt want to start right from
scratch with a package, but instead convert a notebook to a package:
this seems impossible!


Alessandro





______________

oh, damn, you're right - now I remember!

Yet...
1) creating a notebook containing just:
a=2

2) savinga as package file as "test.m"

3) importing it: <<"test.m"

I get no error, but "a" remains undefined.

(version 6.0.2 here)

Looking for the problem, I noticed that the source of test.m is:
(* ::Package:: *)

(* ::Input:: *)
(*a:=2*)

commented out !!!

I saved as package another bigger .nb file, and it did the same: it
comments out everything. When I took away the (* *) of course Get[]
worked.

So? Maybe the right question is "How do I create a Package?" Because
obviously "Save As->Mathematica Package (.m)" is crippled.


David Bailey ha scritto:

> alexxx.magni at gmail.com wrote:
> > a very basic question - sorry for that...
> >
> > probably it's me, almost never having programmed large projects that
> > needed breaking up in different notebooks, so I seldom used the Get
> > (<<) function, but I seemed to remember this function would allow me
> > to Import&evaluate a notebook in another.
> >
> > So, defining simply a=2 in a notebook test.nb, when I executed:
> >
> > <<"test.nb"
> >
> >  I obtained:
> >
> > Notebook[{Cell[
> >    CellGroupData[{Cell[BoxData[RowBox[{"a", "=", "2"}]], "Input",
> >       CellChangeTimes -> {{3.41474*10^9, 3.41474*10^9}}],
> >      Cell[BoxData["2"], "Output", CellChangeTimes -> {3.41474*10^9}]},
> >      Open]]}, WindowSize -> {640, 750},
> >  WindowMargins -> {{150, Automatic}, {Automatic, 52}},
> >  FrontEndVersion -> "6.0 for Linux x86 (32-bit) (February 7, 2008)",
> >  StyleDefinitions -> "Default.nb"]
> >
> > (a verbose output which I didnt remember) and, moreover, my "a"
> > variable still remains undefined!
> > What I'm missing (or forgetting)?
> >
> > thanks!
> >
> > Alessandro
> >
> You are forgetting that Get reads .m files (sometimes known as package
> files), not notebooks. However, in 6.0 .m files can be edited almost as
> if they were notebooks and non-code information such as headings is
> stored in the .m file as comments.
>
> Note also, that if you open a notebook and evaluate it, and then open
> another and evaluate that also, the second evaluation will use any
> relevant definitions from the first one.
>
> David Bailey
> http://www.dbaileyconsultancy.co.uk


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