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Continuously overwriting plot in a loop

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Hans123
Hans123 on 9 Apr 2019
Edited: Peter Cook on 9 Apr 2019
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
matlabissue.png
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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Accepted Answer

Peter Cook
Peter Cook on 9 Apr 2019
Edited: Peter Cook on 9 Apr 2019
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

  2 Comments

Hans123
Hans123 on 9 Apr 2019
Thanks alot for the reply, I am a novice still so I do not fully grasp the meaning of ht.YData or ht.String
Also, after running the code I get this error,
Unrecognized property 'YData' for class 'matlab.graphics.primitive.Text'.
Error in DynamicMathModel (line 203)
ht.YData = model;
Peter Cook
Peter Cook on 9 Apr 2019
Oops It should be hp.YData & ht.String. I'll edit above to reflect that.

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