im trying to create a function that wors the same way as the unique() function without using it

i first wrote it as a stand along program

clear, clc

nput = [1 2 3 4 4 5 5 6 7 8 9];

%function bmatch = findmatch(nput)

q = intersect(nput,nput);

sim = 1 - isequal(q,nput);

if sim == 0;

disp('0')

else sim == 1;

disp('1')

end

then tried to change it to a function but couldnt get it to output anything please help

clear, clc

nput = [1 2 3 4 5 6 7 8 2 9];

function sim = ismatch(nput)

q = intersect(nput,nput);

sim = 1 - isequal(q,nput);

if sim == 0;

disp('0')

else sim == 1;

disp('1')

end

end

Answer 1

[Davide Masiello]

This is rudimentary, but it might be a starting point.

clear, clc

A       = [1 2 3 4 5 6 7 8 2 9 2 1 5];
uniqueA = ismatch(A)

uniqueA = 1×9

1 2 3 4 5 6 7 8 9

function out = ismatch(A)
B = A == A';
B(logical(eye(size(B))) | logical(tril(ones(size(B))))) = 0;
out = A(~any(B,1));
end

However, it still does not do eveything that unique does (sort output, indexes of duplicates etc.).