Why dimension of confusion matrix is higher than the size of group/grouphat in confusionmat?

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Nima 2015-8-13

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编辑： Nima 2015-8-14

I am trying to get confusion matrix for 14 different groups using confusionmat. However, the dimension of the produced confusion matrix is 16*16. I checked the order vector and found that two group labels are repeated and considered as 15th and 16th label??? any help is appreciated...