How to eliminate rows??

a = [30 30 30 10 10 0 0 10 20 20];

 a1 = unique(a);

 a2 = perms([a1,fliplr(a1)]);

 p1 = [a2 , fliplr(a2),a2 , fliplr(a2), a2];

 p2 = p1 (:, 1:length(a));

 ppp = unique(p2,'rows');

pp = permute(ppp, [3 2 1]);

if unique(a) is less than 2 times then i have to eliminate rows in ppp or pp.

Answer 1

[Walter Roberson]

threshold = 2;
ppp( sum(ismember(ppp, a1), 2) < threshold, :) = [];