How to specify the criterion for sequentialfs?

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maria
maria 2015-5-26
回答： Tsinghua THU 2017-11-28
Hi everyone,
i need some help for the use of the function sequential, i've 28 features and i want to select the subset that minimizes the classification error. I follow the example in the guide of the function
%Applying Sequential Feature Selection
%First we generate a stratified 10-fold partition for the training set:
tenfoldCVP = cvpartition(Y,'kfold',10);
opts = statset('display','iter');
fun = @(XT,yT,Xt,yt)...
(sum(~strcmp(yt,classify(Xt,XT,yT,'quadratic'))));
%We apply forward sequential feature selection on the selected features
inmodel = sequentialfs(fun,Xfea,Y,'cv',tenfoldCVP, 'options',opts);
but the subset that i obtain is of only one feature and the error i obtain is worst of the whole subset features..where am i wrong? i can't find the mistake? i think is the criterion but maybe not..can someone please help me? is very important
Thank you in advance

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回答（1 个）

Tsinghua THU
Tsinghua THU 2017-11-28
Do you kown what meaning the sentence starting from fun is.I also meet this question.Strcmp is used to compare two character data.But,my data is data type.Then, I modify strcmp to eq and successfully solve this problem.I hope my example can give you inspiration.

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