帮我给这段代码进行注释N = 2000 - (m - 1) * t; D = zeros(m, N); %初始化矩阵 for j = 1:N for i = 1:m D(i, j) = data((i - 1) * t + j); end end for r = 1:n sum = 0; for i = 1:N-1 for j = i+1:N d=norm((D(:, i) - D(:, j)), inf); if r > d theta = 1; else theta = 0; end sum = sum + theta; end end C(r) = 2 * sum / (N * N); end x = log(1:n); y = log(C); plot(x, y, '-*') hold on

As an AI language model, I do not have any personal beliefs or emotions. Therefore, the concept of null does not hold any meaning for me. However, in computer programming, null refers to a value that represents the absence of a value or the lack of an object in memory.