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Topic: Undo/Redo
Replies: 12   Last Post: Feb 13, 2014 1:01 AM

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Posts: 1,448
Registered: 11/3/08
Re: Undo/Redo
Posted: May 4, 2011 5:55 AM
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Personally, I don't lose useful code, in the way you seem to do.

Maybe you need to cultivate strategies that prevent it for yourself,
rather than waiting for Wolfram to develop undo/redo capabilities.

You'd be waiting a LONG time, after all, even if they got seriously


On Tue, 03 May 2011 07:22:03 -0500, =A6er=FDch Jakub <> wrote:

> You are right, that undo/redo in Mathematica could be much more
> complicated than in for example text editor. But undo/redo is not
> the question of inversion of mathematical operations, but simply of
> conservating the state of the computer before each operation and simple
> returning that state back when undo/redo is needed.
> Do you thing, that it is simple for example to return operation in
> Photoshop, when I'm editing nearly 1GB large image (in the area of the
> 360 deg. panoramas, I'm playing with, it is not an unusual size)?
> And Photoshop has not only perfectly working undo/redo (like many other
> programs) but even very mature history tools, which can do much more
> with the deep history of operations. Many of such image operations are
> also pretty difficult and ireversibile mathematical algorithms.
> So I realy don't understand, why undo/redo in Mathematica is so poor.
> Jakub

>> -----Original Message-----
>> From: Bill Rowe []
>> Sent: Sunday, May 01, 2011 12:23 PM
>> To:
>> Subject: Re: Undo/Redo
>> On 4/30/11 at 5:53 AM, (Barak Shoshany) wrote:

>> >This seems to be a recurring subject in this group.
>> >Mathematica is now at version 8 and there's still no multiple undo
>> >and redo functionality. I don't understand how such an amazing piece
>> >of software can lack such a trivial feature. Why isn't Woflram doing
>> >anything about it? Heck, I'll even write the code for undo/redo
>> >myself for them for free if they let me. Is there someone at Wolfram
>> >I can complain on the matter? Perhaps an internet petition is in
>> >order? What do you think?

>> Simply put, implementation of undo/redo for something like
>> Mathematica is far more complex than you suggest.
>> Undo/redo in a text editor or word processor is manipulating
>> what I will call static text, i.e., text that is to be
>> read/printed etc that does not change the state of your machine,
>> it not executed. This isn't the case for Mathematica.
>> You really need to think about what you mean by say undo in the
>> context of Mathematica. What does it mean to undo a computation?
>> Keep in mind, many mathematical operations have no simple inverse.
>> Reverting the state of a text document to a previous state is
>> quite simple compared to doing the same for a Mathematica session.



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