# How do I combine multiple plots in a for loop?

조회 수: 76 (최근 30일)
Christopher 2013년 10월 18일
댓글: Rik 2019년 6월 11일
Hello all,
I am trying to plot within a for loop, but it only plots the last value, as it's overwritting previous values. My code look like the following:
BLOCK = 5x1 cell array
TIME = 5x1 cell array
for i=length(BLOCK)
plot(TIME(i),BLOCK(i))
end
Not sure how to get this, so it doesn't overwrite previous values. Thank you
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Azzi Abdelmalek 2013년 10월 18일
Christopher commented
I am trying to change the color for each i iteration though. This works, but gives me the same color plot for every iteration.

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### 채택된 답변

Jonathan LeSage 2013년 10월 18일
편집: MathWorks Support Team 2018년 11월 27일
Adding a "hold on" command means that anything that you plot will not clear the existing graph, but just plot on top of what is already there. You can turn off this functionality with the "hold off" command.
for k = 1:length(BLOCK)
plot(TIME(k),BLOCK(k))
if k == 1
hold on
end
end
hold off
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Christopher 2013년 10월 21일
Thank you Jonathan, that is exactly what I was looking to do. I have accepted your answer. Thanks to everyone else for there responses as well.
Rik 2019년 6월 11일
Comment mistakenly posted as flag by AISWARYA LAKSHMI:
This code did not work for me! Only an empty plot screen appears :/

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### 추가 답변 (2개)

dpb 2013년 10월 18일
hold on
after first.
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Hem Zaveri 2014년 11월 1일
I needed to plot graph of frames Vs pixel difference. And the plot was supposed to be inside the for loop. So after seeing this answer I solved one issue, that i update the graph using update. But i want all the points to be connected. Can you help me with it ?
Here is my code
for f = startingFrame+1 : finalFrame
i2 = frame.cdata; %cdata — The image data stored as a matrix of uint8 values. The dimensions of F.cdata are height-by-width-by-3.
ig2 = rgb2gray(i2);
[c2,n2] = imhist(ig2);
c2=c2/size(ig2,1)/size(ig2,2);
d = pdist2(c1',c2','cityblock');
if (d > 0.2150) %%change the threshold
c1 = c2;
m = im2frame(i2);
pause(1/FPS);
end
disp(d);
hold on;
axis([1 95 0.16 0.26]);
plot(f,d,'--rs','LineWidth',2,...
'MarkerEdgeColor','k',...
'MarkerFaceColor','g',...
'MarkerSize',10);
end
f = frame, d = pixel difference which lies between 0.16 - 0.26 </matlabcentral/answers/uploaded_files/20313/asd.PNG>
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ang yong qin 2017년 3월 16일
Maybe you can store the data in a matrix first before plotting the points all together.

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