Delete row with same value but in different columns

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I would like to eliminate rows in the matrix with the same value but in different columns
i want the couples are unique in all rows and in all columns
i used "unique" but it delete rows with same value in same columns
...
2 9 % this value is repeat
2 77
2 157
2 399
2 909
2 1247
3 76
3 175
3 398
3 1164
3 1294
4 82
4 169
...
9 2 % this value is repeat
9 10
9 257
...
i used this code but it is not work
for i = 1:length(A)
for j = i+1:length(A)
if ((A(i,1) ~= A(j,2)) && (A(i,2) ~= A(j,1)))
B(n,1) = n
B(n,2) = A(i,1)
B(n,3) = A(i,2)
n = n+1
end
end
end
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Answers (2)

madhan ravi
madhan ravi on 24 Jul 2019
Edited: madhan ravi on 24 Jul 2019
Wanted = unique(sort(matrix,2),'rows')
%or perhaps you want:
[~,idx] = unique(sort(matrix,2),'rows');
Wanted = matrix(idx,:)
  2 Comments
Danilo Sanfilippo
Danilo Sanfilippo on 24 Jul 2019
Unfortunately it is not what i asked for, but many thanks.
basically i want to delete just one of this row.
According with the previuos example
when i have [2 9; ...; 9 2 ] i want to delete just one of this row.
P.s. the previous code delete other row that were not double
many thanks
madhan ravi
madhan ravi on 24 Jul 2019
Instead of describing, why not show the desired output???

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Jeroen Houwen
Jeroen Houwen on 24 Jun 2021
Dear Danilo,
I might have a simpler version that also works. It is probably a bit late but it is something!
stp = 0;
while stp < length(A)
stp = stp + 1;
A(A(:,1) == A(stp,2),:) = [];
end

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