n=4;
nl=4;
isb=1;
pr=0.00001;
B1=[1 2 0.03i 0 1.05 1;2 3 0.05+0.02i 0.04i 1 0; 2 4 0.04+0.1i 0.04i 1 0; 3 4 0.06+0.3i 0.04i 1 0]('請輸入由各支路參數形成的矩陣:B1=');
B2=[0 0 1.05 0 0 1; 0 1.8+0.9i 1 0 0 2;0 1.6+1i 1 0 0 2; 0 2+0.4i 1 0 0 2]('請輸入各節點參數形成的矩陣:B2=');
Y=zeros(n); e=zeros(1,n);f=zeros(1,n);V=zeros(1,n); 
O=zeros(1,n);S1=zeros(nl);
for i=1:nl
    if B1(i,6)==0
        p=B1(i,1);q=B1(i,2);
    else p=B1(i,2);q=B1(i,1);
    end
    Y(p,q)=Y(p,q)-1./(B1(i,3)*B1(i,5));
    Y(q,p)=Y(p,q);
    Y(q,q)=Y(q,q)+1./(B1(i,3)*B1(i,5)^2)+B1(i,4)./2;
    Y(p,p)=Y(p,p)+1./B1(i,3)+B1(i,4)./2;
end
%求導納矩陣
disp('導納矩陣Y=');
disp(Y);
G=real(Y);B=imag(Y);
for i=1:n
    e(i)=real(B2(i,3));
    f(i)=imag(B2(i,3));
    V(i)=B2(i,4);
end
for i=1:n
    S(i)=B2(i,1)-B2(i,2);
    B(i,i)=B(i,i)+B2(i,5);
end
P=real(S);Q=imag(S);
ICT1=0;IT2=1;N0=2*n;N=N0+1;a=0;
while IT2~=0
    IT2=0;a=a+1;
    for i=1:n
        if i~=isb 
            C(i)=0;
            D(i)=0;
            for j1=1:n
                 C(i)= C(i)+G(i,j1)*e(j1)-B(i,j1)*f(j1);
                 D(i)= D(i)+G(i,j1)*f(j1)+B(i,j1)*e(j1);
            end
            P1=C(i)*e(i)+f(i)*D(i);
            Q1=f(i)*C(i)-D(i)*e(i);
            V2=e(i)^2+f(i)^2;
%117頁malihong打
if B2(i,6)~=3
    DP=P(i)-P1;
    DQ=Q(i)-Q1;
    for j1=1:n
        if j1~=isb&j1~=i
            X1=-G(i,j1)*e(i)-B(i,j1)*f(i);
            X2=B(i,j1)*e(i)-G(i,j1)*f(i);
            X3=X2;
            X4=-X1;
            p=2*i-1;q=2*j1-1;J(p,q)=X3;J(p,N)=DQ;
            m=p+1;
            J(m,q)=X1;J(m,N)=DP;q=q+1;J(p,q)=X4;J(m,q)=X2;
     elseif j1==i&j1~=isb
            X1=-C(i)-G(i,i)*e(i)-B(i,i)*f(i);
            X2=-D(i)+B(i,i)*e(i)-G(i,i)*f(i);
            X3=D(i)+B(i,i)*e(i)-G(i,i)*f(i);
            X4=-C(i)+G(i,i)*e(i)+B(i,i)*f(i);
            p=2*i-1;q=2*j1-1;J(p,q)=X3;J(p,N)=DQ;m=p+1;
            J(m,q)=X1;J(m,N)=DP;q=q+1;J(p,q)=X4;J(m,q)=X2;
       end
    end
else
    DP=P(i)-P1;
    DV=V(i)^2-V2;
    for j1=1:n
        if j1~=isb&j1~=i
             X1=-G(i,j1)*e(i)-B(i,j1)*f(i);
            X2=B(i,j1)*e(i)-G(i,j1)*f(i);
            X5=0;
            X6=0;
            p=2*i-1;q=2*j1-1;J(p,q)=X5;J(p,N)=DV; m=p+1;
            J(m,q)=X1;J(m,N)=DP;q=q+1;J(p,q)=X6;J(m,q)=X2;
      elseif j1==i&j1~=isb
             X1=-C(i)-G(i,i)*e(i)-B(i,i)*f(i);
             X2=-D(i)+B(i,i)*e(i)-G(i,i)*f(i);%118頁孟打印
             X5=-2*e(i);
             X6=-2*f(i);
             p=2*i-1;q=2*j1-1;J(p,q)=X5;J(p,N)=DV;
             m=p+1;
             J(m,q)=X1;J(m,N)=DP;q=q+1;J(p,q)=X6;
             J(m,q)=X2;
                 end
              end
          end
      end
end
%求雅可比矩陣
for k=3:N0
     k1=k+1;N1=N;
     for k2=k1:N1
         J(k,k2)=J(k,k2)./J(k,k);
     end
     J(k,k)=1;
     if k~=3;
         k4=k-1;
         for k3=3:k4
             for k2=k1:N1
                 J(k3,k2)= J(k3,k2)-J(k3,k)*J(k,k2);
             end
             J(k3,k)=0;
         end
         if k==N0,break;end
         for k3=k1:N0
             for k2=k1:N1
                 J(k3,k2)=J(k3,k2)-J(k3,k)*J(k,k2);
             end
             J(k3,k)=0;
         end
    else
        for k3=k1:N0
          for k2=k1:N1
                J(k3,k2)= J(k3,k2)-J(k3,k)*J(k,k2);
            end
            J(k3,k)=0;
        end
    end
end        %119頁zhengtong打%
for k=3:2:N0-1
    L=(k+1)./2;
    e(L)=e(L)-J(k,N);
    k1=k+1;
    f(L)=f(L)-J(k1,N);
end
for k=3:N0
    DET=abs(J(k,N));
    if DET>=pr
        IT2=IT2+1;
    end
end
ICT2(a)=IT2;
ICT1=ICT1+1;
end
%用高斯消去法解“w=-J*V”
disp('迭代次數');
disp(ICT1);
disp('沒有達到精度要求的個數');
disp(ICT2);
for k=1:n
    V(k)=sqrt(e(k)^2+f(k)^2);
    shita(k)=atan(f(k)./e(k))*180/pi;
    E(k)=e(k)+f(k)*j;
end
disp('各節點的實際電壓標么值E為(節點號從小到大排列):');
disp(E);
disp('各節點的電壓大小V為(節點號從小到大排列):');
disp(V);
disp('各節點的電壓相角時shita為(節點號從小到大排列):');
disp(shita);
for p=1:n
    C(p)=0;
    for q=1:n
        C(p)=C(p)+conj(Y(p,q))*conj(E(q));
    end
    S(p)=E(p)*C(p);
end    %120頁打
disp('各節點的功率S為(節點號從小到大排列):');
disp(S);
disp('各條支路的首端功率Si為(順序同您輸入B1時一樣):');
for i=1:nl
     if B1(i,6)==0
         p=B1(i,1);q=B1(i,2);
     else p=B1(i,2);q=B1(i,1);
     end
Si(p,q)=E(p)*(conj(E(p))*conj(B1(i,4)./2)+(conj(E(p)*B1(i,5))-conj(E(q)))*conj(1./(B1(i,3)*B1(i,5))));
     disp(Si(p,q));
end
disp ('各條支路的末端功率Sj為(順序同您輸入B1時一樣):');
for i=1:nl
    if B1(i,6)==0
        p=B1(i,1);q=B1(i,2);
    else p=B1(i,2);q=B1(i,1);
    end
Sj(q,p)=E(q)*(conj(E(q))*conj(B1(i,4)./2)+(conj(E(q)./B1(i,5))-conj(E(p)))*conj(1./(B1(i,3)*B1(i,5))));
    disp(Sj(q,p));
end
disp('各條支路的功率損耗DS為(順序同您輸入B1時一樣):' );
for i=1:nl
   if B1(i,6)==0
       p=B1(i,1);q=B1(i,2);
   else p=B1(i,2);q=B1(i,1);
   end
   DS(i)=Si(p,q)+Sj(q,p);
   disp(DS(i));
end