MATLAB: ??? Input argument “A” is undefined. in the following code of Apriori!

??? input argument "a" is undefined error message in the apriori code

function S=GetNonTrivialSubsets(A)
    n=numel(A);
    S=cell(2^n-2,1);
    for i=1:numel(S)
        f=dec2binvec(i);
        f=[f zeros(1,n-numel(f))]; %#ok
        S{i}=A(logical(f));
    end
end

Best Answer

You need to call the function GetNonTrivialSubsets with an input argument, like this:
 >> X = [1,2,1];
 >> GetNonTrivialSubsets(X)
 ans = 
    [         1]
    [         2]
    [1x2 double]
    [         1]
    [1x2 double]
    [1x2 double]
Very basic MATLAB usage like this is taught very well in the introductory tutorials. All beginners should do them:
https://www.mathworks.com/help/matlab/getting-started-with-matlab.html
https://www.mathworks.com/videos/getting-started-with-matlab-68985.html
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