Error Using Feature Selector

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Luís Dias 2016-2-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/268225-error-using-feature-selector

评论： Greg Heath 2016-2-15

Hey, I´m trying to use sequentialfs to find the more important features to feed my neural network. Here's the code:

in=normc(input);
out2=transpose(output);
out=out2(:,1);
xtrain=in(1:616,:);
xtest=in(617:end,:);
ytrain=out(1:616,:);
ytest=out(617:end,:);
ypred = classify(xtest, xtrain, ytrain);
fun=@(xtrain,ytrain,xtest,ytest) sum(ytest~=classify(xtest,xtrain,ytrain));
inmodel=sequentialfs(fun,in,out);

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The out variable is a 880*1 matrix with the predicted output and the in is a 880*36 matrix with the features.

When I run the program the following errors appear:

Error using classify (line 228)
The pooled covariance matrix of TRAINING must be positive definite.
Error in Example (line 8)
ypred = classify(xtest, xtrain, ytrain);

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I checked and the problem is on the matrixes because if i use other two with random numbers it works.

I have no idea how to solve this. Can you help me?

Thanks in advance,

Luís Dias

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Image Analyst 2016-2-15

We don't have your data, so it's hard to help you.

input() is a built-in function. I don't think it's good practice to use input() as the argument to another function. You didn't make the mistake of calling some array your have "input" did you?