PageRank
参考http://www.doc88.com/p-11465283738.htmlG = [0 1 1 0 1 1 0; 1 0 1 1 0 0 0; 1 0 0 1 1 0 0; 1 0 0 0 1 0 0; 1 0 0 1 0 1 1; 0 0 0 1 1 0 0; 1 0 0 0 0 0 0];[n,n] = size(G);p = 0.85delta = (1-p)/n;sn = sum(G,1); %按列求矩阵G的列和D = diag(1./sn);A = p*G*D + delta;%幂迭代法x = ones(n,1)/n; %迭代初始向量z = zeros(n,1);cnt = 0; %记录迭代步数while max(abs(x-z)) > 0.0001 z = x; x = A * x; cnt = cnt + 1;end[x1,index] = sort(x);x1 = flipud(x1);index = flipud(index);out = [1:n;x1';index'];fprintf('迭代步数 = %d\n',cnt)str1 = '排名';str2 ='PageRank得分'; str3 = '序号';fprintf('%-6s %-15s %-5s\n',str1,str2,str3);fprintf('%-6d %-15f %-5d\n',out);
结果
p = 0.8500迭代步数 = 11排名 PageRank得分 序号 1 0.276926 1 2 0.185228 5 3 0.147001 2 4 0.130779 3 5 0.107858 4 6 0.083714 6 7 0.068494 7