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finding the position of values in a matrix

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sampath kumar punna
sampath kumar punna 2019-10-30
评论： sampath kumar punna 2019-10-30
i have set
X=[
12 14
1 2
12 4
6 14
12 18
12 4
1 2]
Y=[
1 2
1 2
6 14
12 4]
can i get the position of Y elements in X matrix as the number are repeated its hard for me to find using code normal code. can any one please help me.

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回答（1 个）

galaxy
galaxy 2019-10-30
Try
[~,idx]=setdiff(X,Y,'rows');
idx_rows=setdiff(1:size(X,1),idx);
idx_rows =
2 3 4 6 7
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galaxy
galaxy 2019-10-30
because X and Y array has same value, if you want to find only one, you need use unique function
sampath kumar punna
sampath kumar punna 2019-10-30
yes X and Y have same values but Y is not having all values of X only few values are in Y, so for those some values in Y, what is the position in X.

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