How to apply classifier on extracted features?

srcFiles = dir('C:\Users\LENOVO\Desktop\Genuine\2\*.png');  % the folder in which ur images exists
Features = cell(length(srcFiles),1) ;
Valid_points =cell(length(srcFiles),1) ;

for i = 1 : length(srcFiles)
    filename = strcat('C:\Users\LENOVO\Desktop\Genuine\2\',srcFiles(i).name);
    I1 = rgb2gray(imread(filename));
    points1 = detectSURFFeatures(I1); hold on;
    strongest = points1.selectStrongest(10);
    imshow(I1); hold on;
    plot(strongest);
    strongest.Location
    [features1, interest_points] = extractFeatures(I1, points1);
    Features{i} = features1 ;
    Valid_points{i} = interest_points ;
    figure; imshow(I1);
    
end
Features;
Valid_points;