将元素添加到 R 中的调用对象

Question

我想知道如何将 & weeks == 1 添加到下面 s 的末尾？

s <- substitute(type == 1 & ESL == 1 & prof == T) # A `call` object

# Tried the following to add "& weeks == 1" to end of `s` without success:

 c(s, "& weeks == 1")

希望输出如下调用对象：

type == 1 & ESL == 1 & prof == T & weeks == 1

Answer 1

使用 bquote:

无需仅在语言级别转换为文本即可完成此操作

bquote(.(s) & weeks == 1)
## type == 1 & ESL == 1 & prof == T & weeks == 1

将元素添加到 R 中的调用对象

Adding an element to a call object in R

regex

r

function

character

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