filtering values of one matrix according to another

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Sara
Sara 2012-10-10
Hi, I want to filter out rows of one matrix (V) according to values in another (F) and store them in another matrix, V1. F corresponds to some values in the 3rd column of V. The values in F are non-consecutive so a simple loop wouldn't work. Yet filtering using logical indexing (which I normally use) won't work either since F is not a scalar. I'm not a programmer and not a frequent matlab user so it's difficult for me to grasp what's going wrong. I've pasted some of the versions that haven't worked below:
%1 -- didn't work because F is neither a scalar nor the same size of V
F = [4;5;6;9;10;11];
V1 = V((V(:,3) == F ):);
%2 -- this gave a syntax error
start(F(1,1);
end(F(6,1);
V1 = V((V(:,3) >= start <= end ):);
Sounds really stupid but I don't know how to do this?
Sorry!
  1 个评论
Thomas
Thomas 2012-10-10
give an expample of your two inputs and the output you need.. would be easier for us to understand the question..

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2012-10-10
V1 = V(ismember(V(:,3),F),:);

更多回答（1 个）

Sara
Sara 2012-10-10
Brilliant! Thanks

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