我有一些指定为字符串的变量名称(例如来自Shiny应用程序的输入),我想在我的dplyr和ggplot2代码中使用它们,就好像它们是变量一样。dplyr 0.7 - 指定分组变量作为字符串
我通过反复试验了解了它的工作原理,但我觉得必须有更好的方法。什么是更好的方式来执行这些操作?
library(rlang)
library(ggplot2)
library(dplyr)
someString <- "g1"
df <- tibble(
g1 = c(1, 1, 2, 2, 2),
g2 = c(1, 2, 1, 2, 1),
a = sample(5),
b = sample(5)
)
my_summarise <- function(df, group_var) {
print(group_var)
df %>%
group_by(!!group_var) %>%
summarise(a = mean(a))
}
my_plot <- function(df, group_var) {
print(group_var)
ggplot(data = df %>%
group_by(!!group_var) %>%
summarise(a = mean(a)),
aes_string(x = quo_name(group_var), y = "a")) +
geom_bar(stat = "identity")
}
my_summarise(df, quo(UQ(sym(someString))))
my_plot(df, quo(UQ(sym(someString))))