How to extract some rows from a matrix and put them in another matrix?

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Cantor Set
Cantor Set 2020-2-17
回答： JESUS DAVID ARIZA ROYETH 2020-2-17
I have a matrix
Q=[ 1 2 3 4; 4 3 2 1; 6 7 8 9]; N=[1 2 3 4; 6 7 8 9];
is there a function which output: Q=[4 3 2 1]; ? I mean a general function
I tried to delete all the rows which are in N from Q:
for j=1:size(N,1)
Q(all(Q==repmat(N(j,1:end) ,size(Q,1),1),2),:)=[];
end
Q;
Is there a one-line function? does this code I wrote is correct for any arbitrary N and Q?

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采纳的回答

Stephen23
Stephen23 2020-2-17
>> idx = ismember(Q,N,'rows');
>> Q(idx,:) = []
Q =
4 3 2 1

更多回答（1 个）

JESUS DAVID ARIZA ROYETH
setdiff(Q,N,'rows')

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