MATLAB: What happen with confusion matrix

classifierconfusion matrix

Hi, Im trying to create confusion matrix, but the result in the green color or true class is not 100%, if the range 1-10 it should be 10,0% but I get 9,1%. please help me if I wrong? or explain why the result like this ?
here the code and result :
 targetsVector = ttes.'; % True classes
 outputsVector = pred_tes.'; % Predicted classes
 % Convert this data to a [numClasses x 55] matrix
 targets = zeros(11,55);
 outputs = zeros(11,55);
 targetsIdx = sub2ind(size(targets), targetsVector, 1:55);
 outputsIdx = sub2ind(size(outputs), outputsVector, 1:55);
 targets(targetsIdx) = 1;
 outputs(outputsIdx) = 1;
 plotconfusion(targets,outputs)

Best Answer

It looks like you have 55 observations. 51 of them were classified correctly (along the diagonal, indicated in green). But 4 of them were misclassified -- two observations with target class 1, but were in output class 7 and two observations with target class 7, but where in output class 5.
Classifiers are not usually perfect, so misclassifications happen. Did you expect your classifier to be perfect? Why?
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