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How to put a label of type string in a matrix (KNN)

This line put a label for a trainData mat train_labels.push_back(new Mat (1,1,CvType.CV_32FC1,new Scalar(i))) I would put a string label instead of a float label .is it possible ?

How to put a label of type string in a matrix (KNN)

This line put a label for a trainData mat

train_labels.push_back(new Mat (1,1,CvType.CV_32FC1,new ~~Scalar(i)))~~ Scalar(i)))

I would put a string label instead of a float label .is it possible ?