New classification in Machine Learning model with xgboost

Machine Learning and Modeling
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2 
(new_record_raw <- c(5.3,3.2,2.0,0.2))
(new_record_mat <- matrix(new_record_raw,nrow = 1))
(new_record_dmat <- xgb.DMatrix(data = new_record_mat))
predict(xgb1,newdata=new_record_dmat)

or more concisely:

predict(xgb1,
        newdata=xgb.DMatrix(data = matrix(c(5.3,3.2,2.0,0.2)
                                          ,nrow = 1)))
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