First of all, thank you for the example! > > I'm pretty sure it is impossible to decide whether a cells output depends on > the > value of a given variable. You could get it write some of the time by seeing > if the variable appears, but given the dynamic nature of Python it is > impossible to > decide in general. >
What about the preparser? Can't we use it to recognize whether any variable belonging to the "live" list appear in the lines of the current cell? Then, it could just automatically append the "depend" attribute to the cell id. > That said, if you were allowed to tag a cell as depending, then this is easy > to > implement. I've even made an implementation of this in the current notebook: > > http://sagenb.org/home/pub/905/ > > If you try that and evaluate all the cells in order, then you'll see > that changing a and b > causes all the other dependent cells to update. You can add > non-dependent cells and > they won't update. Obviously the above is a bit cumbersome, but could > be made smoother > if it gets at what you're after. > > William > After all, I'd be glad to see if any interest is shown in this direction, since there is a reasonable amount of work around the notebook now. Otherwise, thank you for the discussion :) Maurizio --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
