Continuously overwriting plot in a loop

Question

Hans123 2019-4-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/455341-continuously-overwriting-plot-in-a-loop

编辑： Peter Cook 2019-4-9

Dear MATLAB Gods,

I have a plot in a loop that changes after each iteration, currently I have a hold on...hold off line which plots the graphs on the same figure, rather I need it to overwrite the current plot after each iteration and I need to visually see this too - i.e. see each figure before being updated(animated line)

How can I achieve this, and to see the plot being updated should I have a pause line?

This is what I have

-Another issue I have is the text I have writes over it after each iteration. How can I fix this issue. My code is pasted below

for k=1:length(Mean_step)
    y1=Mean(k);
    x1=Mean_step(k);
    %    yy=cap(cap>475 & cap<485);
    %     y1=min(yy);
    y2=max_cap./10;
    x2=0;
    b=y2;
    
    aaa=(x1*y1)+(y1)*(x2*y2-x1*y1)/(y1-y2);
    bbb=(x2*y2-x1*y1)/(y1-y2);
        
    dist=0:1/3:1600;
    model=aaa./(dist + bbb);
    plot(dist,model,'r-','Linewidth',1.5)
    txt1 = ['Y = ' num2str(aaa) ' / (X + (' num2str(bbb) '))'];
    text(580, 700, txt1,'FontSize',8);
end

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Answer 1

Peter Cook 2019-4-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/455341-continuously-overwriting-plot-in-a-loop#answer_369811

编辑：Peter Cook 2019-4-9

在 MATLAB Online 中打开

Since dist is the same for each loop iteration, and you are only updating model, you should return a handle to the line object before you start looping and just update the YData property. Similarly, you should just do the same for the text object.

y1 = Mean(1);
x1 = Mean_step(1);
y2 = max_cap./10;
x2 = 0;
b = y2;
aaa = (x1*y1)+(y1)*(x2*y2-x1*y1)/(y1-y2);
bbb = (x2*y2-x1*y1)/(y1-y2);
dist = 0:1/3:1600;
model = aaa./(dist + bbb);
hp = plot(dist, model, 'r-', 'Linewidth', 1.5);
txt1 = ['Y = ' num2str(aaa) ' / (X + (' num2str(bbb) '))'];
ht = text(580, 700, txt1, 'FontSize', 8);
for k = 2:length(Mean_step)
    y1=Mean(k);
    x1=Mean_step(k);
    
    aaa=(x1*y1)+(y1)*(x2*y2-x1*y1)/(y1-y2);
    bbb=(x2*y2-x1*y1)/(y1-y2);
    model = aaa./(dist + bbb);
    hp.YData = model;
    
    txt1 = ['Y = ' num2str(aaa) ' / (X + (' num2str(bbb) '))'];
    ht.String = txt1;
    
    drawnow()
end