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extracting values and respective rows from a colummn

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Sami
Sami 2011-6-6
Hallo,
this is my problem:
I have a column B and a matrix A A contains in its first column the values of the B But A has a lot more values which I do not need. I want to create a code that extracts from the matrix A the rows corresponding to the values that are in the B column.
Hope that somebody can help,
Thanks in advance.
Sami

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Matt Fig
Matt Fig 2011-6-6
I assume your A and B look something like this:
% Create some data to work with...
B = [3 5 7 9].';
A = round(rand(10)*100)/100;
A([2 10 4 7],1) = B % Put B in first column of A
To get the rows of A which have the values of B in the first column:
A_new = A(ismember(A(:,1),B),:)
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Jan
Jan 2011-6-6
+1: I *must* vote your answer: it is too obvious that it is the best answer in my opinion. :-)

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