How to use unique function in 2D matrices?

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Maitham Al Lawati
Maitham Al Lawati 2016-10-9
评论： Maitham Al Lawati 2016-10-9
hello
I would like to know how I can use the unique function in matlab in such a way that i take off similar elements out of the 2D matrix, provided that the unique function does NOT SORT out he matrix and does NOT CHANGE ITS SHAPE
for example, consider x = [1 1 2 2 3 3 4 4; 5 5 6 6 7 7 8 8 ; 9 9 10 10 11 11 12 12]
output x = [1 2 3 4; 5 6 7 8; 9 10 11 12]
when I used unique, I did not find a way that did not play around with the shape of the 2D matrix
  2 个评论
Jan
Jan 2016-10-9
Are you sure that all rows contain the same number of unique elements?
Maitham Al Lawati
Maitham Al Lawati 2016-10-9
yes pretty much, I don't really have a problem with the working of the unique function other than the fact that its sorts out everything and changes the 2D matrix to a 1D matrix.

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采纳的回答

Jan
Jan 2016-10-9
x = [1 1 2 2 3 3 4 4; 5 5 6 6 7 7 8 8; 9 9 10 10 11 11 12 12]
nRow = size(x, 1);
c = cell(1, nRow);
for iRow = 1:nRow
c{iRow} = unique(x(iRow, :), 'stable');
end
result = cat(1, c{:}); % Fails if number of unique elements differ

更多回答（1 个）

Marc Jakobi
Marc Jakobi 2016-10-9
编辑：Marc Jakobi 2016-10-9
x = [1 1 2 2 3 3 4 4; 5 5 6 6 7 7 8 8 ; 9 9 10 10 11 11 12 12];
y = unique(x','rows')';

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