How to train data using SOM and map the resukts on data

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AS 2019-4-12

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回答： AS 2019-4-15

Pleases help me. I am stuck in how to train data using SOM and map the results on data. I am using the data file, having dimension 100 by 30. First, I want to apply som to train it and them classify the classes.Please help me to solve this problem. Its very important and urgent also.

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KSSV 2019-4-12

What approach you have used? gui or code? what? Show us code.

AS 2019-4-12

Using Somtoolbox. The data has been classified into 4 classes. But I dont know how to map these classes using som_colorcode on data. So that I will get the classes depth wise. If you have any idea please help me in this

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KSSV 2019-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/456000-how-to-train-data-using-som-and-map-the-resukts-on-data#answer_370359

在 MATLAB Online 中打开

Hope this demo might help you:

X = rands(2,1000);    % some random input
plot(X(1,:),X(2,:),'+r')
net = selforgmap([2 2]);     % divide into four groups 
net = configure(net,X);
plotsompos(net)
net.trainParam.epochs = 1;
net = train(net,X);
plotsompos(net)
%  Groups 
Y = vec2ind(net(X)) ; 
scatter(X(1,:),X(2,:),30,Y,'filled')
% Testing 
x = [0.5;0.3];
y = vec2ind(net(x)) % the give input belongs to this group

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Adam 2019-4-15

Why train for 1 epoch only? I would think you'd need a few hundred, especially with coverSteps explicitly set at 100

KSSV 2019-4-15

Yes.....a typo error.......edited now....

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AS 2019-4-15

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It is not working properly. For I have simply calculated best matching unit after training which gives proper classification. And epoch I have used 200