本文介绍了从文本变量读取rpart输入参数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在使用rpart
来制作决策树.例如:
I'm using rpart
to make a decision tree. For example:
fit <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis)
如何从文本文件中读取公式部分,并以rpart
喜欢的格式获取它?我尝试过:
How do I read in the formula part from a text file and get it in a format that rpart
likes? I've tried:
predictor_variables <- c("Age", "Number", "Start")
rpart_formula <- Kyphosis ~ parse(text=paste(predictor_variables, collapse="+"))
fit <- rpart(rpart_formula, data=kyphosis)
但是我得到一个错误:
invalid type (expression) for variable 'parse(text = paste(predictor_variables, collapse = "+"))'
如何格式化rpart_formula
,以便rpart
正确看到它?
How can I format rpart_formula
so that rpart
sees it correctly?
推荐答案
使用as.formula
:
rpart_formula <- as.formula(
paste("Kyphosis ~ ",
paste(predictor_variables, collapse = " + "),
sep = ""
)
)
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