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# How do I remove a set of repeated values in a x by 2 matrix?

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MR on 22 Mar 2020
Closed: MATLAB Answer Bot on 20 Aug 2021
For example,
Given the matrix:
matrix =
18 4
12 11
11 12
4 18
I want to get rid of the repeated values that happen after the first two rows to just get
matrix =
18 4
12 11
Rik on 25 Mar 2020
In response to your flag ("I posted an unclear question and did not receive help"):
You did receive help. Why don't you try describing the question more clearly if you think that is the problem?

Ajay Kumar on 22 Mar 2020
unique(matrix)

Rik on 25 Mar 2020
I think the code below is what you need. There may be much more efficient methods, but this will do as long as this will not be the bottleneck in your workflow.
clc
v=[18 4
12 11
11 12
4 18];
remove_duplicate_rows(v)
v=[23 2
22 4
21 6
19 8
14 14
8 19
6 21
4 22
2 23];
remove_duplicate_rows(v)
function v=remove_duplicate_rows(v)
keeprows=false(size(v,1),1);
keeprows(1)=true;
for r=2:numel(keeprows)
%check if the values are already in the rows that we want to keep
%compare against numel(unique(v(r,:))) to catch repeated values
if numel(setdiff(v(r,:),v(keeprows,:)))==numel(unique(v(r,:)))
keeprows(r)=true;
end
end
v=v(keeprows,:);
end