Adding an Extra Input Parameter to the Function

Question

MByk 2018-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/402566-adding-an-extra-input-parameter-to-the-function

评论： MByk 2018-5-25

How can I add an extra input parameter to the function below? I want to add switch-case inside the function.

[features,history] = sequentialfs(@fun,X,Y,...
        'direction','forward','cv',cvt,'options',dsp_options);
 function cl_err = fun(xTrain,yTrain,xTest,yTest)
   .....  
 end

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Ameer Hamza 2018-5-25

What does switch case have to do with the input arguments? Please clarify your question.

MByk 2018-5-25

编辑：MByk 2018-5-25

在 MATLAB Online 中打开

Actually I asked this question before I want to compare different classifiers. So I planned to pass an input parameter to the function to select different classifier in each iteration. Like below. Btw all suggestions are welcomed.

function cl_err = fun(xTrain,yTrain,xTest,yTest,i)
switch i
  case 1     
  ..... 
  case 2
  .... 
end 
end

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Answer 1

dpb 2018-5-25

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Since sequentialfs is a builtin Toolbox function, you'll really not want to mess with it directly; write a wrapper function around it to use with a specific alternate name and make the modifications desired there; then have it pass the arguments on to the builtin function.

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MByk 2018-5-25

Thank you very much.

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Answer 2

Guillaume 2018-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/402566-adding-an-extra-input-parameter-to-the-function#answer_321951

在 MATLAB Online 中打开

[features,history] = sequentialfs(@(xTrain,yTrain,xTest,yTest) fun(xTrain,yTrain,xTest,classifier) , ...
      X,Y,'direction','forward','cv',cvt,'options',dsp_options);
function cl_err = fun(xTrain,yTrain,xTest,yTest,i)
    switch i
    ...