consider the following example:

j:2

for(j,range(1,4),a:j)

j=4

Now edit the loop expression and change it to any expression without assignment operator with or without j in it

for(j,range(1,4),a)

When leaving the math region, nothing happens.

j=4

As soon as you trigger re-calculation manually, j changes to 2, indicating that the loop iteration is not performed in the global namespace.

j=2

Still there is iteration as you can see using trace(j) as loop body.

for(j,range(1,4),trace(j))

I think, that changes in expressions should trigger re-calculation if that option is set in the options.

Also, I really discourage the use of implicit variable scoping magics. I guess that it is not by intent to overwrite the global imaginary unit i depending on what precisely you do inside iterations with i as counter.

If the mentioned dependency is a feature and not a bug I would like to learn how this contributes to comprehensable documents.

Best regards, Martin Kraska

Edited by user 23 March 2014 18:35:46(UTC)  | Reason: Not specified