methods (Access = private)

        function results = start(app, XD)

            regu = PopulacjaStart(app.ileOs);

            tic;

            if app.wybor == "iteracje"

                x = 1;

            elseif app.wybor == "czas"

                x = toc;

            end
            z = 1;

            data = zeros([1, app.itera]) * nan;
            j = zeros([1, app.itera]) * nan;
            axis(app.UIAxes, [0, inf, 0, inf]);

            while  x <= app.itera && app.Sterowanie.Value == "Start"


                nastepne = feval(XD, regu, app.obiekt, app.szanse);
                if app.metoda.Value == "Ruletka"
                    pary = ParRUL(nastepne);
                    potom = KrzyzRUL(pary);
                elseif app.metoda.Value == "Rangowa"
                    pary = ParRANG(nastepne);
                    potom = KrzyzRANG(pary,app.ileOs);
                end

                mut = Mutacja(potom);
                regu = mut;

                pause(0)

                [FC, PR, CR, UCH, KC] = PIDOptimFun(regu(1, :), app.obiekt);
                .
                .
                .