caret train method not working (something is wrong for all accuracy results) for outcomes with >2 categories

Question

Hi I know someone asked similar issues before but no clear answer yet (or I tried their solution without success: Caret error using GBM, but not without caret Caret train method

Answer 1

Instead of passing the formula in the train function, pass values for parameters x, y, method etc

the old way:

modFit = train(data.df$Label ~ ., 
                 data = data.df, 
                method = "rpart", 
                trControl= cntr, 
                tuneLength = 7)

new way:

modFit = train(x = data.df.cols, 
                 y = data.df$Label,
                 method = "rpart",
                   trControl = cntrl, 
                   tuneLength = 7)

Note: x = data.df.cols has all columns except the label, data.df.cols = data.df[,2:ncol(data.df)]