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identify duplicate entries of matrix and delete

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Poulomi Ganguli
Poulomi Ganguli 2017-10-13
评论： Star Strider 2017-10-14
Hello,
I have an array as follows. I need to identify duplicate row values from column 1 to 5 and delete the row with negative 7th column element and keep the other row. For example, here row values 5 and 6:
1973 4 1 13 1,34 1,31 0,95 0,35
1973 4 2 2 1,17 1,14 0,85 0,29
1973 4 2 8 -0,5 -0,53 -0,81 0,28
1973 4 2 15 1,54 1,51 1,03 0,48
1973 4 2 18 1,82 1,79 1,03 0,76
1973 4 2 18 1,82 1,79 -0,54 2,33
1973 4 3 3 2,24 2,21 1,02 1,19
1973 4 3 15 1,73 1,70 1,15 0,54
The resulting matrix
1973 4 1 13 1,34 1,31 0,95 0,35
1973 4 2 2 1,17 1,14 0,85 0,29
1973 4 2 8 -0,5 -0,53 -0,81 0,28
1973 4 2 15 1,54 1,51 1,03 0,48
1973 4 2 18 1,82 1,79 1,03 0,76
1973 4 3 3 2,24 2,21 1,02 1,19
1973 4 3 15 1,73 1,70 1,15 0,54
Any help?

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Star Strider
Star Strider 2017-10-13
Assigning your matrix to variable ‘M’, this should do what you want:
[~,idx] = unique(M(:,1:5), 'rows', 'stable');
Result = M(idx,:);
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