The Glade 4.0

who the #$%$#% builds software without an auto-save and undo features anymore???

Ugh! 3 hours of work down the tubes due to a program crash. My own fault for not saving, but seriously, auto-save/recovery & undo have been standard on most software packages for 10 years now.

http://reference.wolfram.com/language/r ... oSave.html

And to answer the inevitable follow up question

http://mathematica.stackexchange.com/qu ... by-default

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Buckle your pants or they might fall down.

Yeah, I'm aware ...now. would have been nice if that was a feature my instructor would have mentioned up front.

Still, why no undo? I find it hard to believe that programming issues of an undo feature is so insurmountable that this feature (that prevents the regular use of an autosave)

Your instructor was probably unaware.

Mathematica is not Excel or Word. Despite the fact that you can write programs, it is not the front-end text editor for a coding utility. Mathematica is designed for performing mathematical operations. You enter input, you execute, and you get output. You want a history of that so you can check it later. After you execute, there's nothing to undo. You are finished with that input command, and the output is whatever it is. If you made a mistake, you go fix it and run it again.

Undo doesn't edit command logs. It edits active text.

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Buckle your pants or they might fall down.