hello everyone. How to divide a group of points named data into two parts, dataA and dataB, as shown in the figure. Thank you very much.

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Wesley 2021-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/846075-hello-everyone-how-to-divide-a-group-of-points-named-data-into-two-parts-dataa-and-datab-as-show

评论： Wesley 2021-6-2

采纳的回答： Stephan

data.mat

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Wesley 2021-6-2

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Stephan 2021-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/846075-hello-everyone-how-to-divide-a-group-of-points-named-data-into-two-parts-dataa-and-datab-as-show#answer_715160

编辑：Stephan 2021-6-2

在 MATLAB Online 中打开

% divide data
idx = clusterdata(data,2);
dataA = data(idx==2,:);
dataB = data(idx==1,:);
% plot results
scatter(dataA(:,1),dataA(:,2))
hold on
scatter(dataB(:,1),dataB(:,2))
hold off

result is:

Note that this needs Statisitcs and Machine Learning Toolbox.

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Stephan 2021-6-2

result of kmeans:

Wesley 2021-6-2

It is very helpful to me. Thank you for your warm-hearted reply.

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KSSV 2021-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/846075-hello-everyone-how-to-divide-a-group-of-points-named-data-into-two-parts-dataa-and-datab-as-show#answer_715155

在 MATLAB Online 中打开

x = data(:,1) ;
y = data(:,2) ;
mx = mean(x) ; my = mean(y) ; 
idx = y < my ; 
x1 = x(idx) ; y1 = y(idx) ; 
x2 = x(~idx) ; y2 = y(~idx) ; 
plot(x,y,'.r')
hold on
plot(mx,my,'*b')
plot(x1,y1,'.b')
plot(x2,y2,'.g')