create a 2d matrix making sure that the second column from the left and second column from the right are equal to the column number in matlab

main.m
% define matrix size
n_rows = 5; % number of rows
n_cols = 4; % number of columns

% initialize matrix with zeros
matrix = zeros(n_rows, n_cols);

% populate matrix
for i = 1:n_rows
    for j = 1:n_cols
        % check if current column is second from the left or right
        if (j == 2) || (j == n_cols - 1)
            % set current element to the column index
            matrix(i,j) = j;
        end
    end
end

% display matrix
disp(matrix);
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