我不理解这里出了什么问题。
我遇到了以下错误:
data.train <- read.table("Assign2.WineComplete.csv",sep=",",header=T)
# Building decision tree
Train <- data.frame(residual.sugar=data.train$residual.sugar,
total.sulfur.dioxide=data.train$total.sulfur.dioxide,
alcohol=data.train$alcohol,
quality=data.train$quality)
Pre <- as.formula("pre ~ quality")
fit <- rpart(Pre, method="class",data=Train)
我遇到了以下错误:
Error in eval(expr, envir, enclos) : object 'pre' not found
read.table
行,然后执行:fit <- rpart(pre ~ quality, method="class",data=data.train)
。 - Thomas