function deltdeltF=func_deltdeltF(busNum,fsY11,Loadi)

deltdeltF=[
  %zeros(busNum*2,busNum*2+length(Loadi)*2);
  sparse(Loadi,Loadi,2,busNum,busNum*2+length(Loadi)*2);
  sparse(Loadi,busNum+Loadi,2,busNum,busNum*2+length(Loadi)*2);
  zeros(length(Loadi)*2,busNum*2),2*eye(length(Loadi)*2);
  %sparse(Loadi,busNum*2+Loadi,2,busNum,busNum*2+length(Loadi)*2);
];
end