有没有“整洁”的方法可以连接数据框列表(类似于
full_join()
,但是用于>2个数据框)?我有一个数据框列表,这是调用map()
的结果。我以前使用Reduce()
做过类似的事情,但是想将它们合并为管道的一部分 - 只是还没有找到优雅的方法来实现。玩具示例:library(tidyverse)
## Function to make a data.frame with an ID column and a random variable column with mean = df_mean
make.df <- function(df_mean){
data.frame(id = 1:50,
x = rnorm(n = 50, mean = df_mean))
}
## What I'd love:
my.dfs <- map(c(5, 10, 15), make.df) #%>%
# <<some magical function that will full_join() on a list of data frames?>>
## Gives me the result I want, but inelegant
my.dfs.joined <- full_join(my.dfs[[1]], my.dfs[[2]], by = 'id') %>%
full_join(my.dfs[[3]], by = 'id')
## Kind of what I want, but I want to merge, not bind
my.dfs.bound <- map(c(5, 10, 15), make.df) %>%
bind_cols()
purrr::reduce
是Reduce
的包装器,参数被反转以更好地进行管道操作。 - alistairepurrr::reduce
这个函数。谢谢! - Jennifer Thompson