Here is the code to achieve it:
S = {rand(1000, 2), rand(1000, 2), rand(1000, 2)};
% Number of cells in the cell array
num_cells = numel(S);
% Initialize an empty array to store the second columns
% Assuming all matrices have the same number of rows
num_rows = size(S{1}, 1);
second_columns = zeros(num_rows, num_cells);
% Loop through each cell and extract the second column
for i = 1:num_cells
second_columns(:, i) = S{i}(:, 2);
end
% Display the resulting matrix
disp('Matrix of second columns:');
disp(second_columns);
