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Re: A kernel, multiple notebooks, and Global?

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  • Subject: [mg87694] Re: A kernel, multiple notebooks, and Global?
  • From: dh <dh at>
  • Date: Tue, 15 Apr 2008 06:50:55 -0400 (EDT)
  • References: <fu1u15$ojn$>


both your assumptions are correct.


AES wrote:

> Pardon any awkward wordings here, but I may not have all the jargon 

> relevant to my query clearly understood.


> Suppose that on a single-user computer I have several notebooks open 

> that address different parts of a common calculation, and thus share 

> overlapping sets of globally used variable names.  


> The broad question is then, how far can I go -- or what dangers may lurk 

> -- in treating these multiple notebooks as essentially one unified 

> notebook that just happens to be stored in multiple files and appear on 

> screen in multiple windows?


> 1)  For example, in terms of contexts or scopes, I'm guessing that 

> "Global is Global":  the Global` context for all of these notebooks is 

> set by or recorded by the kernel, and at any one instant is exactly the 

> same for all these open notebooks  -- right?


> 2)  Suppose a certain Input cell is present in exactly identical form at 

> some random (i.e., different) point in each of the notebooks; I've been 

> executing cells from all of the notebooks in some irregular sequence; 

> and then I execute this particular cell in whichever of the notebooks 

> happens to be most convenient for me.


> I assume the kernel is likely to be able to recognize which notebook 

> submitted these Input instructions.  But beyond that, unless this cell 

> contains some code which directly or indirectly identifies the notebook 

> in which the cell resides, and uses this information to modify the Input 

> instructions, executing the copy of this cell that resides in any of the 

> notebooks will produce exactly the same result, except for where it 

> displays its output -- right?


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