www.gusucode.com > matlab从零到进阶程序与数据 > matlab从零到进阶程序与数据/第4章 MATLAB程序设计/ForLooPCompare4.m

    function y = ForLooPCompare4(x)
y(512,512) = 0;
tic;
for k2 = -1:1
    for k1 = -1:1
        for j = 2:511
            for i = 2:511                
                y(i,j) = y(i,j)+x(i+k1,j+k2)/9;
            end
        end
    end
end
toc