How can i shorten the duration this code takes? it takes 0.4 seconds to complete if you insert a longer string. I would prefer not using the for loop but it is still welcome

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Waboraro Olefile 2016-9-1

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https://ww2.mathworks.cn/matlabcentral/answers/301631-how-can-i-shorten-the-duration-this-code-takes-it-takes-0-4-seconds-to-complete-if-you-insert-a-lon

评论： Waboraro Olefile 2016-9-1

this code scans a string for letters and ignores repeating letters, for example scans 'xyxzyx' and returns 'xyz' as there are only 3 letters present. the goal is to re-write in a way that takes less time to execute. thanks in advance... here is the code

str='shdydjsgdnsladhdksjkhdjksa'
fixed2=str; %ignore the redundancy
A1=fixed2;
    for i=1:numel(fixed2)
      k=fixed2(i);
      A1=regexprep(A1,'(?<=(??@k).*)(??@k)','')
   end