Comment 1: I think it is a good idea to change lines 46 and 49 as follows:
(46) temp=[TopTickPositions(:), TopTickLabels(:)];
(49) temp = sortrows(temp);
This will allow users to enter either row or column vectors (or both) for the ticks and labels.
Comment 2 (regarding the bug that Thierry reported):
It can be fixed if line 50 is replaced by
temp(diff(temp(:,1))==0,:) = ;
Thank you so much for this submission! It took me 15 minutes of playing around with it to figure it out (it wasn't immediately clear to me that TopTickPositions were the positions on the original axis and that TopTickLabels were the associated values on the new axis). But it works great! I really appreciate it - thanks!!