Removing rows with identical column value

Hello. I have a 2 x 3 matrix.

I want to delete all rows which have the same elements in column 3.

For instance: a = [2,7; 3,4; 3,7] => [3,4]

In this case, as number 7 was repeated in row 1 and row 3, both rows are removed.

Thanks in advance.

Answer 1

[harjeet singh]

hello miguel use this code

clear all
close all
clc

a = [2,7; 3,4; 3,7];
b=[];
for i=1:size(a,1)
    [r,c]=find(a(:,1)==a(i,1));
    if(length(r)==1)
        b=[b;a(i,:)];
    end
end
b

[Miguel L]

It works very nice Harjeet Singh. Thanks.

Answer 2

[Star Strider]

a = [2,7; 3,4; 3,7];
[Au,ia,ic] = unique(a(:,2), 'stable');
rep = accumarray(ic, 1);
rows = find(ic == ic(rep<2));
Result = a(rows,:)

Result =
     3     4

[Miguel L]

It works Star problem solved.