![](/img/trans.png)
[英]“Variable context not set” error with mutate_at, dplyr version >= 0.7
[英]dplyr 0.7 - Specify grouping variable as string
我有一些指定为字符串的变量名(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,就像它们是变量一样。
我通过反复试验使它起作用,但是我觉得必须有更好的方法。 有什么更好的方法来执行这些操作?
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))))
这些选项可能更简单:
my_summarise <- function(df, group_var) {
print(group_var)
df %>%
#Either works
group_by_at(.vars = group_var) %>%
#group_by(!!sym(group_var)) %>%
summarise(a = mean(a))
}
my_summarise(df,someString)
my_plot <- function(df, group_var) {
print(group_var)
ggplot(data = df %>%
group_by_at(.vars = group_var) %>%
#group_by(!!sym(group_var)) %>%
summarise(a = mean(a)),
aes_string(x = group_var, y = "a")) +
geom_bar(stat = "identity")
}
my_plot(df, someString)
...您可以在其中使用group_by
或group_by_at
。
用my_summarise(df, as.name(someString))
调用怎么办?
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.