How to specify the criterion for sequentialfs?

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

Answer 1

[Tsinghua THU]

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.