matlab动点显示

%%导入卡农.mps，data是一堆数据，然后显示
clear
clc
colordef black
data=audioread('卡农.mp3');
data =data(200919:753400,:);
a1 = animatedline('Color',[0 .7 .7]);
a2 = animatedline('Color',[0 .5 .5]);
 data_size = size(data(:,1));
 data_max = max(data(:,1));
 data_min = min(data(:,1));
%axis([1 data_size(1) -1 1 ])
x = linspace(0,(data_size(1)-1),data_size(1));
y1 = data(:,1);
y1 = y1';
y2 = data(:,2);
y2 = y2';
%m = 0;
k = 1;
% while (k>10*m)&&(k<=10*(m+1))&&(k<data_size(1)) 
while (k>0)&&(k<data_size(1)) 
    axis([0 10 -0.02 0.02 ])
%       if k ==10*(m+1) 
          if k>10
            axis([k-9 k-1 -0.02 0.02 ])
             text(x(k),y1(k),'o','color','g');
          end
        %m = m+1; 
%       end

   addpoints(a1,x(k),y1(k));
   disp('x(k)')
   disp(x(k))
   disp('y1(k)')
   disp(y1(k))
    k = k+1;
    pause(1)
    drawnow 
end

　　效果如下图所示，但是，因为text标注的点，会已知留着标注，所以结果差一点，不知道怎么纠正，希望看过的朋友帮忙看一下