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Table back to its original form?

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wesleynotwise am 8 Jun. 2017
Kommentiert: breathi am 15 Nov. 2021
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)?

Antworten (2)

Star Strider
Star Strider am 8 Jun. 2017
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 Kommentar
Guillaume am 8 Jun. 2017
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 am 8 Jun. 2017
Bearbeitet: KSSV am 8 Jun. 2017
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.
  3 Kommentare
Peter Perkins
Peter Perkins am 9 Jun. 2017
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 am 15 Nov. 2021
@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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