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How to combine several features of a hand

I have extracted the following features of hand: compactness, aspect ration and orientation and stored them in a .csv file. Now I want to train them using KNN. KNN takes a matrix as input, how should I combines these features into a single Mat and train them.

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updated 2016-03-26 22:21:11 -0500

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How to combine several features of a handhand for machine learning

I have extracted the following features of hand: compactness, aspect ration and orientation and stored them in a .csv file. Now I want to train them using KNN. KNN takes a matrix as input, how should I combines these features into a single Mat and train them.