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Re: Question about Initialization Cells

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126421] Re: Question about Initialization Cells
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Wed, 9 May 2012 03:51:24 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <jo2nke$mdk$1@smc.vnet.net> <201205080806.EAA24026@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

That's something good to know: from time to time there have been posts 
to this list asking about how to arrange exactly the same restriction -- 
typically by somebody used to another CAS system and expecting 
definitions in one notebook, by default, to be confined to that 
notebook's context.

On 5/8/12 4:06 AM, David Reiss wrote:
> Evaluate the following in the notebook:
>
> Options[EvaluationNotebook[], CellContext]
>
> If the result is
>
> {CellContext ->  Notebook}
>
> then that means that the notebook has been set so that any function
> defined in it is defined in a Context unique to that notebook.  If so,
> then those functions will not be in the context path for Mathematica
> to find them in another notebook and would need to be called there by
> their full context path.
>
> --David
>
>
> On May 5, 4:16 am, James Stein<ja... at stein.org>  wrote:
>> I downloaded the source code for a Wolfram Demonstrations Project; this one:http://demonstrations.wolfram.com/ComparingAlgorithmsForTheTravelingS...
>>
>> The first three cells, all initialization cells, each contain a simple
>> one-liner, for example:
>>           dist[p1_, p2_] := Norm[p1 - p2]
>> When I evaluate any of these cells, it appears to define the function, but
>> when I try (in a second, new notebook window) to evaluate the function
>> (e.g., to evaluate "dist[4.5]}), the function is undefined. It is blue i
>> the second window, even though it is black in the first window.
>>
>> But If I type "dist[4,5]" in the demonstration project window itself, all
>> works as expected.
>>
>> The demo project does not appear to be a package; 'dist' does not seem to
>> be private. What am I missing?
>
>

-- 
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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