MATLAB: How to move to the next trial without generating new window of figure

moving to next trial

I'm working on generating attention shift task. And I'm very beginner of MATLAB. When I run this code, it kept generating new figure window. However, I want to make it goes to the next trial without generating new window with the figure. Could someone tell me what did I wrong? Thanks a lot!
DATA = zeros(80,1); % pre-allocation of data matrix
ExoHorizentalV100 = 0;
jj = 1; 
while ExoHorizentalV100 < 80
    coin = rand;
    if coin < 0.5 % cue and target presented in the right
        fig = figure;        
        set(fig,'position',get(0,'ScreenSize'))
        r1 = rectangle('position',[0,150,100,100],'EdgeColor','k','Linewidth',3);
        xlim([0 400])
        ylim([0 400])
        hold on
        plot(200,200,'+','MarkerSize',30,'LineWidth',3,'Color','k');
        hold on
        r2 = rectangle('position',[300,150,100,100],'EdgeColor','k','Linewidth',3);
        axis square;
        axis off;
        pause(4)
        t = text(180,270,'\rightarrow','FontSize',40,'LineWidth',3,'Color','k');
        pause(0.1) 
        set(t,'Visible','off')
        plot(350,200,'kp','MarkerSize',30,'MarkerFaceColor','k')
        pause(0.3)
        elseif coin > 0.5 % cue and target presented in the left
        fig = figure; 
        set(fig,'position',get(0,'ScreenSize'))
        r1 = rectangle('position',[0,150,100,100],'EdgeColor','k','Linewidth',3);
        xlim([0 400])
        ylim([0 400])
        hold on
        plot(200,200,'+','MarkerSize',30,'LineWidth',3,'Color','k');
        hold on
        r2 = rectangle('position',[300,150,100,100],'EdgeColor','k','Linewidth',3);
        axis square;
        axis off;
        pause(4)
        t = text(180,270,'\leftarrow','FontSize',40,'LineWidth',3,'Color','k');
        pause(0.1) 
        set(t,'Visible','off')
        plot(50,200,'kp','MarkerSize',30,'MarkerFaceColor','k')
        pause(0.3)
        end
    tic; pause ; temp = toc;
    response = get(fig,'CurrentCharacter');
    ExoHorizentalV100 = ExoHorizentalV100 + 1;
    DATA(jj,1) = temp;
    jj = jj + 1;
end

Best Answer

Take
        fig = figure;        
        set(fig,'position',get(0,'ScreenSize'))
out of the loop
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