Error in table(data, reference, dnn = dnn, ...) : all arguments must have the same length error while making confusion matrix.

[andresrcs]

@jalaj_geete

prediction7b=confusionMatrix(prediction7,as.factor(test7$smoker))

The error message comes from this line of code, apparently prediction7 and test7 don't have the same number of rows, possibly because there are NAs in test 7 but we can't be sure with out a proper REPRoducible EXample (reprex).