Hello everyone. Now I come across such a problem: given the coordinates of all points of the closed curve acbd, now I want to find all points of the curve ACB and save them. The code I write is as follows, but there are always mistakes. I

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Wesley 2021-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/843920-hello-everyone-now-i-come-across-such-a-problem-given-the-coordinates-of-all-points-of-the-closed

回答： darova 2021-6-1

M0.mat

在 MATLAB Online 中打开

Where M0 is the set of all points.

CODE:

dc=centroids(:,2);
   idx2=MO(:,1)>=-50;
   idx3=MO(:,1)<=100;
   idx4=MO(:,2)>=dc;
   dataC=MO(idx2,:);
   dataD=MO(idx3,:);
   dataE=MO(idx4,:);
   dataF=intersect(dataC,dataD,'rows');%Finding the intersection of dataF,
   dataG=intersect(dataF,dataE,'rows');%Finding the intersection of dataG

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Wesley 2021-5-31

idx3=MO(:,1)<=x;

idx4=MO(:,2)>=y;

Can we intercept data together?

Wesley 2021-5-31

Or can ACB data be cut out by straight line AD and BD?

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darova 2021-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/843920-hello-everyone-now-i-come-across-such-a-problem-given-the-coordinates-of-all-points-of-the-closed#answer_714695

在 MATLAB Online 中打开

M0.mat

Here is your data looks like

s = load('M0.mat');

[x,y] = deal(s.M(:,1),s.M(:,2));

plot(x,y)

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