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Re: Re-virginating Manipulates?

Also, on the issue of localization, I had some success using With[] to
run several Manipulates (spawned from one template) in parallel.

John Fultz mentioned something about the importance of With[] during
this year's tech conference, but I forgot specifics except that one
should keep an eye on With in terms of localization. Of course I may
remember wrongly and would be happy to be corrected and/or educated on
the issue.


Am 30.11.2010 10:04, schrieb Ingolf Dahl:
> This interaction between different Manipulate cells can be a pest,
> especially in the authoring notebook for a new demonstration, where you
> should have the same Manipulate cell in several variants, as thumbnail and
> as snapshots. If you manipulate one of them, the other cells might interact,
> especially if some variables are defined in the Initialization option. I
> denote this problem "the Isolation Problem". The Manipulate command puts all
> controls inside a DynamicModuleBox, (hopefully) isolating them from
> interaction with other cells. However, variables defined by the
> Initialization option are defined outside the DynamicModule, and they might
> interfere with outside code and other Manipulate cells, if the same variable
> names are reused. According to my current understanding, there are three
> measures you could take: some combination of  them could be effective.
> Please correct me if I am wrong, I would very much appreciate that.
> 1) One way to avoid interaction between Manipulate cells is of course to use
> strictly different names in the different cells, maybe containing some
> cell-specific string in such a way that it easily replaced.
> 2) Another method is to use an option CellContext, which might be set to
> Cell for the whole notebook. Then, a unique default context is used for
> every cells in the notebook.
> The CellContext option can be set by selecting Format -> Option Inspector ->
> (Selected Notebook, by Category) -> Cell Options -> Evaluation Options ->
> CellContext. It might alternatively be set by the command
> SetOptions[EvaluationNotebook[ ], CellContext->Cell].
> However, I am not sure that this always is effective to stop interaction
> between the cells.
> 3) If we do Show Expression on the Manipulate cell (Shift+Ctrl+E in
> Windows), we see that all variables are defined in the $CellContext`
> context. Do Find&Replace and replace $CellContext` with something else, e.g.
> CellContext01`. Close Show Expression and open the next Manipulate cell, and
> replace in the same way with CellContext02`, and so on.
> Measure 1 and 3 might break down if we then do "Update thumbnails and
> snapshots" in a Demonstrations authoring notebook.
> Best regards
> Ingolf Dahl
> ingolf.dahl at
>> -----Original Message-----
>> From: AES [mailto:siegman at]
>> Sent: den 29 november 2010 12:07
>> To: mathgroup at
>> Subject:  Re-virginating Manipulates?
>> Let's define the label "virgin" for a Mathematica notebook as referring
>> to the condition and content of a notebook file that's been opened for
>> the first time, had some cells typed into it, maybe been Saved, but none
>> of its cells have ever been executed.
>> How can one re-virginate such a notebook (and also the currently
>> running Mathematica app and kernel, if necessary) after any (or all) of
>> the cells in this notebook have been executed one or more times --
>> especially if the notebook contains one or more Manipulates?
>> [If you want more detail, the objective is to code a number of
>> (potentially multi-cell) "demos" -- call them demo_a, demo_b, ... --
>> each of which contains a Manipulate, and all of which are totally
>> independent of each other (no transfer of info between different demos
>> needed or wanted); and then be able to jump around randomly amongst
>> these demos, executing or re-executing them, and getting identical
>> results each time a given demo is executed, regardless of what's
>> happened before it is selected and executed.
>> Each demo is, preferably, a separate notebook (a separate file),  or
>> multiple demos could be cascaded in a single notebook, in the form
>>       <<Header cell>>
>>       demo_a
>>       <<Header cell>>
>>       demo_b
>>       <<Header cell>>
>>       demo_c
>>       <<Header cell>>
>> What initial cells does each demo_x need to make that demo execute as a
>> virgin demo when jumped to?]

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