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How can i get the output?

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VIJAY
VIJAY 2017-9-14
关闭： MATLAB Answer Bot 2021-8-20
i have the matrix
A=[1 2 4;
1 2 3;
4 5 6;
7 8 9;
4 5 8;
9 1 3];
i hope to compare first two column only comparison in the matrix so i need the output as
A=[7 8 9;
9 1 1]

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回答（1 个）

Rik
Rik 2017-9-14
I'm going out on a limb here: I will assume your question is how to remove all rows where the first two values are non-unique. This rephrasing immediately points to the solution: use the unique function with the 'row' switch and the additional output (the position). Then we count occurrences with hist and remove all rows with an occurrence not equal to 1.
A=[1 2 4;
1 2 3;
4 5 6;
4 5 8;
9 1 3;
7 8 9];
[~,indexInMatrix,positionOfRowInUniqueVector]=unique(A(:,1:2),'rows','stable');
[numOfOccurrences,~]=hist(positionOfRowInUniqueVector,unique(positionOfRowInUniqueVector,'stable'));
rowIndex=indexInMatrix(numOfOccurrences==1);
A=A(rowIndex,:);

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