function deltG=func_deltG(busNum,Loadi,I1r,I1i)
% dgV_dPD=sparse(length(Loadi),busNum);
% dgV_dQD=sparse(length(Loadi),busNum);
% dgV_dx=[sparse(1:busNum,1:busNum,ones(busNum,1),busNum,busNum);
%     sparse(busNum,busNum);
%     ];
% %
% dgPD_dPD=sparse(eye(length(Loadi)));
% dgPD_dQD=sparse(length(Loadi),length(Loadi));
% dgPD_dx=sparse(busNum*2,length(Loadi));
% %
% dgQD_dPD=sparse(length(Loadi),length(Loadi));
% dgQD_dQD=sparse(eye(length(Loadi)));
% dgQD_dx=sparse(busNum*2,length(Loadi));
% %% 

deltG=[
    zeros(busNum*2,length(Loadi)*1);
    2*eye(length(Loadi)*1)*diag(I1r);
    2*eye(length(Loadi)*1)*diag(I1i);
];
end