dplyr mutate替换动态变量名 [英] dplyr mutate replace dynamic variable name

问题描述

以下代码将hwy> 25的值替换为0，否则为0。

The following code replaces the values of hwy > 25 with 1 otherwise 0.

library(ggplot2)
data(mpg)
mpg %>% mutate(hwybin=replace(hwy>25,1,0))

如何用hwy替换为变量名。以下行：

How would I do the replace with hwy as a variable name. Something along the lines of:

varname <- "hwy"
mpg %>% mutate(hwybin=replace(varname>25,1,0))

我觉得我缺少一些明显的东西。谢谢。

I feel like I'm missing something obvious. Thank you.

推荐答案

也可以将评论变成答案（并使您的问题重现）：

Might as well turn the comment into an answer (and make your question reproducible):

library(dplyr)
library(ggplot2)
library(lazyeval)

data(mpg)

a <- mpg %>% mutate(hwybin=replace(hwy>25, 1 ,0))

varname <- "hwy"
b <- mpg %>% mutate_(hwybin=interp(~replace(varname>25, 1 ,0),
                                   varname=as.name(varname)))

identical(a, b)
## [1] TRUE

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