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Table back to its original form?

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wesleynotwise
wesleynotwise 2017-6-8
评论： breathi 2021-11-15
So one can sort the data in any column of a table in an ascending / descending order from the drop-down list on the heading. However, is there a way to turn the sorted table back to its original form (unsorted)?

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回答（2 个）

Star Strider
Star Strider 2017-6-8
If you kept the index vector from the sorted data, you can ‘unsort’ them:
x = randi(99, 10, 1); % Original Data
[xs,idx] = sort(x); % Sorted Data & Index
x_unsort(idx) = xs; % ‘Unsorted’ Data
If you didn’t keep it, all hope is lost.
  1 个评论
Guillaume
Guillaume 2017-6-8
If you didn’t keep it, all hope is lost
Which is exactly the case (didn't keep it) if you use the UI to do the sorting. You'll notice that matlab outputs the command it uses to do the sorting to the command window, and it is of the form:
yourtable = sortrows(yourtable, columnname, direction);
whereas you'd need
[yourtable, order] = sortrows(...)
to be able to restore the order.
There's no workaround other than doing the sorting through the command window rather than the UI, unfortunately.

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KSSV
KSSV 2017-6-8
编辑：KSSV 2017-6-8
Read about Sort. You have to do that using a command/ function sort.
k = [3 4 5 1 2 3 6] ;
[val,idx] = sort(k) ;
Your sorted k is val and your original data remains same as k.
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Peter Perkins
Peter Perkins 2017-6-9
If by "in MATLAB", you mean "at the MATLAB command line", others have provided the answer: use the second output of sort. If you mean "in the Variable Editor", can you not use the Undo button or ctrl-z?
breathi
breathi 2021-11-15
@Peter Perkins: You can use Ctrl+Z or the Undo button, but only once. Once you make 2 sort commands in the Variable Editor, it's over.

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