How do I extract the rows of a matrix when I have the row numbers stored in another vector?

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Dave
Dave 2013-4-28
I have a 102x3 matrix, I need to extract all the rows that have the number 1 in the first column and put them in a separate matrix.
Ive tried using the find function to produce a vector listing all the row numbers of when this occurs however I am not sure how to use this to extract the whole rows from the large matrix.

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Wayne King
Wayne King 2013-4-28
编辑：Wayne King 2013-4-28
A = randi([0 4],102,3);
idx = find(A(:,1) == 1);
B = A(idx,:);
Another way:
B = A(A(:,1)==1,:);

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