How can i get the output?

Question

VIJAY 2017-9-14

0
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关闭： MATLAB Answer Bot 2021-8-20

i have the matrix

A=[1 2 4;
2 3;
5 6;
8 9;
5 8;
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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KSSV 2017-9-14

How this output comes?

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Answer 1

Rik 2017-9-14

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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,:);