error : Matrix must have equal dimensions-CodePudding

I have been trying this. Model can't give me confusion matrix

    fit <- rpart(taste ~ ., data = train,method="class",control = rpart.control(cp = 0.01)) 
    summary(fit)



    knn_prediction <- predict(fit, test)
    confusionMatrix(knn_prediction, test$taste)

#when i tried the confusion matrix it gives me error : matrix must have equal dimensions

CodePudding user response：

Default argument of type of predict.raprt is prob, which makes knn_prediction of yours matrix.

You should use type = "class" to make confusion matrix with your code.

Try

knn_prediction <- predict(fit, test, type = "class")