错误:未为此S4类定义$运算符 [英] Error: $ operator not defined for this S4 class

问题描述

我正在尝试制定公式，但出现错误:

I'm trying to make a formula and I got the error:

未使用R为此S4类定义$运算符.

$ operator not defined for this S4 class with R.

首先，什么是S4类?我在做什么错了?

First of all, what is a S4 class? What am I doing wrong?

以下代码:

as.formula("ctree(d$sex ~ d$ahe , data = d)")

如果要复制它，则数据集(CSV文件) d 为

If you want to reproduce it, the dataset (CSV file) d is available here.

推荐答案

您在此处给 as.formula 输入错误.只有 d $ sex〜d $ ahe 应该是公式，所以:

You are giving as.formula the wrong input here. Only d$sex ~ d$ahe should be a formula, so:

ctree(as.formula("d$sex ~ d$ahe"))

或者:

ctree(as.formula("sex ~ ahe"), data = d)

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