make a cluster from scatter point

2020 10 17
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更新时间：2020 10 18
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Hi
I have attached my scatter poit figure and I want to make a 2 or 3 clusters from them.
This is my code;
for i = 1:size(MeanEchos,1);
for j = 1:size(MeanEchos,2);
scatter(blob_area{2,j},MeanEchos{2,j},'x');
set(gca,'xscale','log');
grid on;
xlabel('Blob Area');
ylabel('Mean Echo Intensity');
xlim([0 10^5]);
ylim([0 5])
end
end
I would be greateful if anyone would be able to help me.
Thanks in advance

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Ameer Hamza
Ameer Hamza 2020-10-17

0 个投票

If you have statistical and machine learning toolbox, then try kmeans(): https://www.mathworks.com/help/releases/R2020b/stats/kmeans.html

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Thanks! how I can make 1 array from these two double cell array blob_area{2,j} and MeanEchos{2,j}?
because when I want to use kmeans, it needs to be one array.
blob area here is x of my figure and means echos is y.
Ameer Hamza
Ameer Hamza 2020-10-18
I think following should work
x1 = [blob_area{2,:}].';
x2 = [MeanEchos{2,:}].';
X = [x1 x2];
Input X to kmeans(). If there is an error, can you attach the variables blob_area and MeanEchos in a .mat file.
Thanks so much for your respond. I do really appreciate it.
With the new code that you ahve sent, I am receiving an error of 'Vectors must be the same length.'
I have attached my data here. Baically as you can see in the screen shot od scatter point, the first distribution needs to be cluster #1 and second distribution needs to be cluster #2.
Ameer Hamza
Ameer Hamza 2020-10-18
These lines wok without error on my machine. How are you typing these lines?
Yes you are right. I used your code and thanks so much for that.
However, I want to make sure that I am receieving the right resualt.
My all lines are stated as bellow;
x1 = [blob_area{3,:}].';
x2 = [MeanEchos{3,:}].';
X = [x1 x2];
opts = statset('Display','final');
[idx,C] = kmeans(X,2,'Distance','cityblock',...
'Replicates',255,'MaxIter',1000,'Options',opts);
figure;
plot(X(idx==1,1),X(idx==1,2),'r.','MarkerSize',12)
hold on
plot(X(idx==2,1),X(idx==2,2),'b.','MarkerSize',12)
plot(C(:,1),C(:,2),'kx','MarkerSize',15,'LineWidth',3)
legend('Cluster 1','Cluster 2','Centroids',...
'Location','NW')
title 'Cluster Assignments and Centroids'
hold off
I attached the figure as well. based on the initial figure, is my result right?
Also, thanks so much for all your help, with that 2 lines I got my answer after 2 days working.
Ameer Hamza
Ameer Hamza 2020-10-18
From the images, it seems that the results are correct. It clearly shows two clusters. I am glad to be of help!

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