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

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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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