function [ output_args ] = obj( this,x )
%OBJ Summary of this function goes here
%   Detailed explanation goes here
PDi=this.PDi;
QDi=this.QDi;
PD=x(1:length(PDi));
QD=x(length(PDi)+1:length(PDi)+length(QDi));
wPD=this.wPD;
wQD=this.wQD;
% wVolt=this.wVolt;
PD0=this.PD0;
QD0=this.QD0;
t4=(wPD(PDi).*(PD-PD0(PDi))).^2;
t5=(wQD(QDi).*(QD-QD0(QDi))).^2;
output_args=sum(t4)+sum(t5);
end