Full_Name: Song Qifan Version: 2.7.0 OS: Windowa Xp Submission from: (NULL) (58.207.200.53) When I used the package "ada" to realize a boosting algorithm, there occures a bug. I use the function "ada" to produce a ada object from the training data. After that, I use the function "predict.ada" to predict the output for just ONE input, but the result is a vector containing 50 numbers. However, if I use the "predict.ada" to predict the outpt for a data.frame which contains several input, the function will calculate the correct result.