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I'm trying to separate my document into cell groups, each with their own context (much like the style of code isolation described by the answer here: Localizing variables within a Manipulate), but the I can't get the grouped cells to share a context, even though Notebook's Default Context is set as "Unique to each cell group."

I have a simple example. The linked notebook appears as a single cell group (when I look at the grouping bars along the right side of the window), but multiple calls of Print[$Context] yield different results.

It seems like, once a cell has been created, it's context doesn't change even if I adjust the grouping. What is going on in the simple example I posted, and is there a way to fix these weird context differences/prevent them from happening?

Thanks!

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    $\begingroup$ With 8.0.4 on Mac 10.6.8 I find cell contexts changing whenever the grouping is changed. What version and platform are you using? $\endgroup$ Feb 17, 2013 at 21:52
  • $\begingroup$ Oh, huh, does the above document print all the same or all different $Context numbers for you? I'm using 9.0.0 on Ubuntu 12.10. $\endgroup$
    – Sam Bader
    Feb 17, 2013 at 23:43

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I should mention that I eventually resolved this confusion. Fultz's answer (referenced above) said

Separate the examples into cell groups. You can use, e.g., Section or Subsection cells to do this

I was thinking of cell groups merely as any cells joined by the brackets on the right-side of the screen, and I was manually adjusting the grouping. This did not work. Evidently, using Section or Subsection cells is the appropriate way to have Mathematica treat cell groups properly for variable isolation.

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