考慮這個簡單的例子如何將ggplot和dplyr合併爲一個函數?
library(dplyr)
library(ggplot2)
dataframe <- data_frame(id = c(1,2,3,4),
group = c('a','b','c','c'),
value = c(200,400,120,300))
# A tibble: 4 x 3
id group value
<dbl> <chr> <dbl>
1 1 a 200
2 2 b 400
3 3 c 120
4 4 c 300
在這裏,我想要寫一個函數,數據框和分組變量作爲輸入。理想情況下,經過分組和彙總後,我想打印一張ggpplot
圖表。
這工作:
get_charts2 <- function(data, mygroup){
quo_var <- enquo(mygroup)
df_agg <- data %>%
group_by(!!quo_var) %>%
summarize(mean = mean(value, na.rm = TRUE),
count = n()) %>%
ungroup()
df_agg
}
> get_charts2(dataframe, group)
# A tibble: 3 x 3
group mean count
<chr> <dbl> <int>
1 a 200 1
2 b 400 1
3 c 210 2
不幸的是,加入ggplot
成以上函數失敗
get_charts1 <- function(data, mygroup){
quo_var <- enquo(mygroup)
df_agg <- data %>%
group_by(!!quo_var) %>%
summarize(mean = mean(value, na.rm = TRUE),
count = n()) %>%
ungroup()
ggplot(df_agg, aes(x = count, y = mean, color = !!quo_var, group = !!quo_var)) +
geom_point() +
geom_line()
}
> get_charts1(dataframe, group)
Error in !quo_var : invalid argument type
我不明白什麼是錯在這裏。有任何想法嗎? 謝謝!
編輯:有趣的後續這裏how to create factor variables from quosures in functions using ggplot and dplyr?
該死!你知道我該如何修復我的代碼然後?謝謝!! –