% Assuming M is your large matrix with size 20000000x9
% Let's create some dummy data for demonstration
rng(0); % For reproducibility
M = randi([-1, 1], 20000000, 9);
% Find rows where the first and second columns are zero
rowsWithZeros = (M(:, 1) == 0) & (M(:, 2) == 0);
% Extract those rows
extractedRows = M(rowsWithZeros, :);
% Display the size of the extracted rows to see how many we've found
size(extractedRows)
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