MATLAB: How to delete duplicate values from an array or a vector

delete duplicate values

How to delete duplicate values from an array or a vector
Hi, how do I delete duplicate values from an array or a vector provided that unique function is not used and that the place of the value does not remain empty or zero. The result is like this
a=[1 2 3 6 1 3 1];
a=[1 2 3 6]
b=[1 1 3
3 4 5
4 9 1];
b=[1 3 4 5 9]

Best Answer

b=[1 1 3
    3 4 5
    4 9 1];
% The clean solution:
b = unique(b(:).')
% [1 3 4 5 9]

   
% Without unique:
bs = sort(b(:).');
result = bs([true, diff(bs) ~= 0])
% [1 3 4 5 9]
   
% For a stable output (order of elements does not change):
[bs, vec] = sort(b(:).');
uvec(vec) = [true, diff(bs) ~= 0];
result    = b(uvec);
% [1  3  4  5  9]
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