本文介绍了用gpplot2使用dplyr SE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

我经常在包装函数中将 dplyr ggplot2 结合进行分析。当我正在转向使用 tidyeval 的v.0.7.1的新NSE / SE范例时,我正在努力使这个组合发挥作用。我发现 ggplot 不理解未加引号的quosers(还)。以下不起作用:

  example_func<  -  function(col){
col< - enquo(col )
mtcars%>%count(!! col)%>%
ggplot(aes((!! col),n))+
geom_bar(stat =identity)

example_func(cyl)
错误!col:无效参数类型

我目前使用以下解决方法。但我认为必须有更好的方法。

  example_func2<  -  function(col){
col< - enquo(col)
mtcars%>%count(!! col)%>%
ggplot(aes_string(rlang :: quo_text(col),n))+
geom_bar(stat =identity)
}

请告诉我最好的方法结合这两者。如果您已经在处理问题,那么使用 aes _ 接受以公式引用的输入: aes_(col,〜n)



这段代码解决了你的问题:
$ b $ pre $ library(tidyverse)
example_func< - function(col){
col< ; - enquo(col)
mtcars%>%count(!! col)%>%
ggplot(aes_(col,〜n))+
geom_bar(stat =identity )
}

example_func(cyl)


I often combine dplyr with ggplot2 in wrapper functions for analysis. As I am moving to the new NSE / SE paradigm of v.0.7.1 with tidyeval, I am struggling to get this combination to work. I found that ggplot does not understand unquoted quosers (yet). The following does not work:

example_func <- function(col) {
  col <- enquo(col)
  mtcars %>% count(!!col) %>% 
    ggplot(aes((!!col), n)) +
    geom_bar(stat = "identity")
}
example_func(cyl)
# Error in !col : invalid argument type

I currently use the following work-around. But I assume there must be a better way.

example_func2 <- function(col) {
  col <- enquo(col)
  mtcars %>% count(!!col) %>% 
    ggplot(aes_string(rlang::quo_text(col), "n")) +
    geom_bar(stat = "identity")
}

Please show me what the best way to combine these two. Thanks!

解决方案

If you are already handling quosures it's easier to use aes_ which accepts inputs quoted as a formula: aes_(col, ~n).

This bit of code solves your problem:

library(tidyverse)
example_func <- function(col) {
  col <- enquo(col)
  mtcars %>% count(!!col) %>% 
    ggplot(aes_(col, ~n)) +
    geom_bar(stat = "identity")
}

example_func(cyl)

这篇关于用gpplot2使用dplyr SE的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

11-01 16:39