Delete row with same value but in different columns

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

[Danilo Sanfilippo]

n =1 ;
for i = 1:length(A)
    if A(i,1)> A(i,2)
        B(n,1) = A(i,2);
        B(n,2) = A(i,1);
        n = n+1;
    end
end
n =1;
for i = 1:length(A)
    if A(i,1)< A(i,2)
        C(n,1) = A(i,1);
        C(n,2) = A(i,2);
        n = n+1;
    end
end
BB = unique((B), 'rows');
CC = unique((C), 'rows');
BBCC = [BB;CC];
D = unique(sortrows(BBCC), 'rows');

I solved it

thanks

[madhan ravi]

Hmm doesn't it produce the same result as below??

[Danilo Sanfilippo]

no sorry

[madhan ravi]

isequal(Wanted,D)

Answer 1

[madhan ravi]

Wanted = unique(sort(matrix,2),'rows')
%or perhaps you want:
[~,idx] = unique(sort(matrix,2),'rows');
Wanted = matrix(idx,:)

[Danilo Sanfilippo]

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]

Instead of describing, why not show the desired output???

Answer 2

[Jeroen Houwen]

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