# How can I separate the elements of a vector ?

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Rayan Glus on 27 May 2022
Commented: Rayan Glus on 27 May 2022
Hello,
I have a row vector i of size say 1x300 and that its indices can be any number of the range [1 5] in a descending order. For example:
i = [5 3 3 3 3 3 3 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 0 0 0 0 0]
As you can notice number 4 is not always in i. And I'm trying to separate the similar numbers into 4 groups in this example.
for jj = max(i):-1:0
t = i==jj;
idx = find(t~=0);
.
.
.
end
In this particular example, jj should take only values 5,3,2,1,0. But it is not since the step is -1. And the resulting idx is empty.
When i is like the following, my code works fine.
i = [6 6 5 4 4 4 3 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 0 0 0 0 0]

Stephen23 on 27 May 2022
for jj = i(diff(i)~=0)
or
for jj = unique(i,'stable')
Rayan Glus on 27 May 2022
Thank you so much. I really appreciate it

Walter Roberson on 27 May 2022
File Exchange, run length encoding. If I recall correctly, contribution is from Jan.
Rayan Glus on 27 May 2022
Thanks Walter. I will check it out.