Remove same element from vector
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I have this vector
E=[1,2;1,3;1,6;2,3;2,4;3,7;4,5;5,6;5,7;6,7;1,2;2,4;6,8];
I want to omit same element and also (6,8).
As 8 is not conneted to other points, I want to omit it too.
result is: E=[1,2;1,3;1,6;2,3;2,4;3,7;4,5;5,6;5,7;6,7];
采纳的回答
Andrei Bobrov
2018-11-30
0 个投票
a = sort(unique(E,'rows'),2);
b = unique(a(:));
c = hist(a(:),b);
out = a(all(ismember(a,b(c > 1)),2),:);
更多回答（2 个）
madhan ravi
2018-11-30
编辑：madhan ravi
2018-11-30
E=[1,2;1,3;1,6;2,3;2,4;3,7;4,5;5,6;5,7;6,7;1,2;2,4;6,8];
[E,~,~]=unique(E,'rows');
idx=ismember(E,[6 8],'rows');
E=E(~idx,:) %expected result
command window:
>> E
E =
1 2
1 3
1 6
2 3
2 4
3 7
4 5
5 6
5 7
6 7
>>
Guillaume
2018-11-30
What you have completely failed to mention in your question and left for us to guess is that your E matrix represents the edges of a graph. Without that information, "8 is not connected to other point" is meaningless.
One way to do what you want:
E=[1,2;1,3;1,6;2,3;2,4;3,7;4,5;5,6;5,7;6,7;1,2;2,4;6,8];
g = graph(E(:, 1), E(:, 2)); %remove duplicate edges and make graph
g = simplify(g); %remove duplicate edges and self loops
g = rmnode(g, find(degree(g) <= 1)); %remove isolated nodes or nodes with only one edge
E = g.Edges.EndNodes
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