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Join repeated continuous elements of a vector

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Alexander
Alexander 2020-2-27
关闭： MATLAB Answer Bot 2021-8-20
Hi, is there a simple method to join repeated continuous elements of a vector in Matlab?
For example if the input is:
in = [1 1 1 2 2 3 6 6 6 1 1 1 4 4 4 2 2 2 6 4 4]
how can i get
out = [1 2 6 1 4 2 6 4]
Note that since 3 is not repeted, it is not in 'out' vector. Same for the only 6.
thanks !

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回答（1 个）

Are Mjaavatten
Are Mjaavatten 2020-2-27
in = [1 1 1 2 2 3 6 6 6 1 1 1 4 4 4 2 2 2 6 4 4];
i = 1;
count = 1;
out = [];
a = in(1);
while i < length(in)
i = i+1;
if in(i) ~= a
count = 1;
a = in(i);
else
count = count + 1;
end
if count == 2;
out = [out,a];
end
end
disp(out)
  1 个评论
Alexander
Alexander 2020-2-27
Thanks for your time
Your code works just fine !
This one works too:
in = [1 1 1 2 2 3 6 6 6 1 1 1 4 4 4 2 2 2 6 4 4];
BB=diff(find(diff(in)~=0));
in(diff(m)==0) = [];
in(find(BB==1)+1)=[];
out = in;

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