www.pudn.com > daima.rar > daima.txt, change:2010-07-10,size:1269b


unction [Wt,Pp]=mintreek(n,W) 
%附图,红色连线为最小生成树的图; 
tmpa=find(W~=inf);[tmpb,tmpc]=find(W~=inf); 
w=W(tmpa);e=[tmpb,tmpc];  
[wa,wb]=sort(w);E=[e(wb,:),wa,wb];[nE,mE]=size(E); 
temp=find(E(:,1)-E(:,2));E=E(temp,:); 
P=E(1,:);k=length(E(:,1)); 
while (rank(E)>0) 
    temp1=max(E(1,2),E(1,1));temp2=min(E(1,2),E(1,1)); 
    for i=1:k; 
        if (E(i,1)==temp1), E(i,1)=temp2; end; 
        if (E(i,2)==temp1), E(i,2)=temp2; end; 
    end; 
        a=find(E(:,1)-E(:,2));E=E(a,:); 
        if (rank(E)>0),P=[P;E(1,:)];k=length(E(:,1)); end; 
end; 
Wt=sum(P(:,3));Pp=[e(P(:,4),:),P(:,3:4)]; 
for i=1:length(P(:,3));  
    disp(['   ','e',num2str(P(i,4)),' ','(v',... 
    num2str(P(i,1)),' ','v',num2str(P(i,2)),')']); 
end; 
% 以下是画图程序 
axis equal; hold on 
[x,y]=cylinder(1,n);xm=min(x(1,:)); ym=min(y(1,:)); 
xx=max(x(1,:)); yy=max(y(1,:)); 
axis([xm-abs(xm)*0.15,xx+abs(xx)*0.15,ym-abs(ym)*0.15, yy+abs(yy)*0.15]); plot(x(1,:),y(1,:),'ko') 
for i=1:n; temp=['  v',int2str(i)]; 
   text(x(1,i),y(1,i),temp); end; 
for i=1:nE; plot(x(1,e(i,:)),y(1,e(i,:)),'b'); end; 
for i=1:length(P(:,4)); 
  plot(x(1,Pp(i,1:2)),y(1,Pp(i,1:2)),'r'); end; 
text(-0.35,-1.2,['最小生成树的权为',' ',num2str(Wt)]); 
title('红色连线为最小生成树'); axis('off');hold off