GUI axes only plots the last values in a for loop!

I am trying to plot values in an axes inside GUI in matlab. The code must load 18000*132 matrix and scatter plot few columns for 18000 times. For test purpose, I wrote the code to plot two scatter plot from the matrix for 200 times. The code works fine if i run it in a normal .mat file but it doesn't work properly if I run it inside GUI axes. The GUI code shows no error but plot only once and it's the 200th value's plot. I am new in matlab GUIDE.

Any help to solve the problem is highly appreciated.

   function open_OpeningFcn(hObject, eventdata, handles, varargin)

         handles.output = hObject;
         ax1 = handles.axes1;
         load('PMelisa01.mat', 'PMelisaD20180404Walkingnone01');

         MelisaW = cell2mat(PMelisaD20180404Walkingnone01);

    for i=1:200
        PMelisaD20180404Head_x= MelisaW(i,4)/100;
        PMelisaD20180404Head_y= MelisaW(i,5)/100;
        PMelisaD20180404Head_z= MelisaW(i,6)/100;
        %2
        PMelisaD20180404Head_End_x=MelisaW(i,10)/100;
        PMelisaD20180404Head_End_y=MelisaW(i,11)/100;
        PMelisaD20180404Head_End_z=MelisaW(i,12)/100;

        scatter3(ax1,PMelisaD20180404Head_x,PMelisaD20180404Head_y,PMelisaD20180404Head_z,'filled')
        hold on 
        scatter3(ax1,PMelisaD20180404Head_End_x,PMelisaD20180404Head_End_y,PMelisaD20180404Head_End_z,'filled')
        hold off
        drawnow
    end
    guidata(hObject, handles);