matlab计算节点重要度

function Z=floyd（ady）
              n=size（a1）;               %矩阵维数
              Z=zeros（n1）;              %节点重要度向量                           
              %由邻接矩阵a得到直接距离矩阵H
              H=zeros（size（a））;
              for i=1:n
                  for j=1:n
                      if j==i
                          H（ij）=0;
                      elseif a（ij）==1
                          H（ij）=1;
                      else
                          H（ij）=inf;
                      end
                  end
              end
              
              %用Floyd法计算节点收缩前的最短距离矩阵D
              D=H;                           
              for k=1:n
                  for i=1:n
                      for j=1:n
                          if D（ik）+D（kj）                              D（ij）=D（ik）+D（kj）;                             
                          end 
                      end 
                  end                                    
              end
              
              %计算节点重要度
              D2=zeros（size（D））;              
              for i=1:n                  
                  %得到与节点i邻接的节点向量I
                  I=zeros（10）;
                  t=0;
                  for j=1:n
                      if a（ij）==1
                          t=t+1;
                          I=[Ij];
                      end
                  end
                  
                %计算收缩前的最短距离矩阵D2
                for p=1:n
                    for q=1:n
                        if p~=i&q~=i
                            if D（pi）+D（iq）==D（pq）
                                D2（pq）=D（pq）-2;
                            elseif D（pi）