如何dplyr :: inner_join多个tbls或data.frames在R中

在R中,如何有效地inner_join多个tbls或data.frames？

例如：

devtools::install_github("rstudio/EDAWR")
library(EDAWR)
library(dplyr)
data(songs)
data(artists)
test <- songs
colnames(test) <- c("song2","name")
inner_join(songs,artists,by="name") %>% inner_join(test,by="name")

我想要加入的数百个测试类的data.frames.

解决方法

您可以在列表中收集数据帧,并使用Reduce：

L <- list(songs,test)
Reduce(inner_join,L)

#   name  plays                song               song2
# 1 John guitar Across the Universe Across the Universe
# 2 John guitar       Come Together Across the Universe
# 3 John guitar Across the Universe       Come Together
# 4 John guitar       Come Together       Come Together
# 5 Paul   bass      Hello,Goodbye      Hello,Goodbye

您可以使用L< - mget(ls())(具有可选模式arg to ls)将所有内容都放入列表中. 在评论中提到的@akrun,plyr的选择是：

library(plyr)
join_all(L,type='inner')

原文地址：https://www.jb51.cc/mssql/81393.html