# Removing replication in matlab

6 views (last 30 days)
Mohamed Jamal on 14 Jul 2020
Commented: Mohamed Jamal on 14 Jul 2020
Hi guys, I have string like this
str= '000000011111100000000000000000000000000000000000111111100000000000000000000011110000000000000000000000000001111111001101'
I want to remove replication of zero and ones in that string this means , the output would be like this '010101010101' without replication of zero or ones ... *be careful that I dont know number of replication of zeros or ones in the str string ...
any help please how can I do that in matlab? thanks alot.

madhan ravi on 14 Jul 2020
regexprep(str,{'0+','1+'},{'0','1'})
Mohamed Jamal on 14 Jul 2020
Appreciated!!!!!!
thanks alot
John D'Errico on 14 Jul 2020
Better than my solution of course.

John D'Errico on 14 Jul 2020
But the string, after you remove the replicates will always be identically the same, just alternating 0's and 1's. If the first element is a '0', then the string will be '010101010...'. If the first element is a 1, then it will be opposite. The only question is the length of the string.
My point is, don't even worry about removing the replicated elements. Just create the final result as it must be.
newstr = str(1);
if newstr == '0'
% Count the number of '10' transitions
newstr = [newstr,repmat('10',[1,numel(strfind(str,'10'))])];
% was the final element a '1'
if str(end) == '1'
newstr = [newstr,'1'];
end
else
% then the first element was a '1'
% So count the number of '01' transitions
newstr = [newstr,repmat('01',[1,numel(strfind(str,'01'))])];
% was the final element a '0'
if str(end) == '0'
newstr = [newstr,'0'];
end
end
For example, with str as in your example, this produces:
newstr =
'010101010101'
Mohamed Jamal on 14 Jul 2020
Hi all good, I have took this into consideration, already done it ! anyone I appreciate your effort!
could you please help me here because Im really stuck! , it's not good to share you here but any assistance would be appreciated: