function deltdeltF=func_deltdeltF(busNum,fsY11,Loadi,wV1r,wV1i,wI1r,wI1i,V1measurement,V1r,V1i)
% wV1r_=(1)^2*ones(length(wV1r),1);
% wV1i_=(1)^2*ones(length(wV1i),1);
% wI1r_=(1)^2*ones(length(wI1r),1);
% wI1i_=(1)^2*ones(length(wI1i),1);
% infWV=find(wV1r==Inf);
% infWI=find(wI1r==Inf);
% wV1r=wV1r_;
% wV1i=wV1i_;
% wI1r=wI1r_;
% wI1i=wI1i_;
% wV1r(infWV)=Inf;
% wV1i(infWV)=Inf;
% wI1r(infWI)=Inf;
% wI1i(infWI)=Inf;

W2=wV1r.*wV1r;
t1=-2*V1r(Loadi).*V1r(Loadi)+ abs(V1measurement).^2;
t2=-(V1r(Loadi).^2+ V1i(Loadi).^2);
ttt=-4*(t1+t2  )./W2;
t3=-4*V1r(Loadi).*( -2*V1i(Loadi))./W2;
deltdeltF=[
  %zeros(busNum*2,busNum*2+length(Loadi)*2);
  sparse(Loadi,Loadi,ttt,busNum,busNum),sparse(Loadi,Loadi+busNum,t3,busNum,busNum+length(Loadi)*2);
  sparse(Loadi,Loadi,-4*V1i(Loadi).*( -2*V1r(Loadi))./W2,busNum,busNum),sparse(Loadi,Loadi+busNum,-4*( -2*V1i(Loadi).*V1i(Loadi)+ abs(V1measurement).^2-(V1r(Loadi).^2+ V1i(Loadi).^2) )./W2,busNum,busNum+length(Loadi)*2);
  sparse(length(Loadi)*2,busNum*2),2*eye(length(Loadi)*2)*diag(1./[wI1r.^2;wI1i.^2]);
  %sparse(Loadi,busNum*2+Loadi,2,busNum,busNum*2+length(Loadi)*2);
];
end