find subarray for which for which the value of thefirst two colums is zero

Hello

I have an array M(20000000,9).

I need to extract the elements for which the first column value and the second column values are zero.

any ideas?

Thank you

Answer 1

[Hassaan]

% 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)

ans = 1×2

2222971 9

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[Robert Jones]

Thank you, it works