extract Vector's index from Matrix

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Fatma Gargouri
Fatma Gargouri 2011-11-14
Hello,
I have a matrix M size(M)=n*2
and a Vector V size(V)=n*1
in the fist colomn of M we find some indexes of V I want to extract the indexes of V which are not used in M.
is that possible?
thank you

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采纳的回答

Grzegorz Knor
Grzegorz Knor 2011-11-14
ismember function might be helpful.

更多回答（2 个）

Walter Roberson
Walter Roberson 2011-11-14
Much more directly:
setdiff(V, M(:,1))
Fatma Gargouri
Fatma Gargouri 2011-11-14
thank you Grzegorz Knor
K=M(:,1);
p=1;
for i=1:size(V,1)
ind=ismember(i,K);
if ind==0
R(p)=i;
p=p+1;
end
end

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