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Re: Saving Packages

  • To: mathgroup at smc.vnet.net
  • Subject: [mg86798] Re: Saving Packages
  • From: David Bailey <dave at Remove_Thisdbailey.co.uk>
  • Date: Fri, 21 Mar 2008 01:54:21 -0500 (EST)
  • References: <fro3a6$i8l$1@smc.vnet.net> <frqpnm$505$1@smc.vnet.net> <frt5j1$t2i$1@smc.vnet.net>

alexxx.magni at gmail.com wrote:
> 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
> 
Change the style of every cell that is executable to style Code.

David Bailey
http://www.dbaileyconsultancy.co.uk


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