本文介绍了遍历dplyr中的列?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
df <- data.frame(col1 = rep(1, 15),
col2 = rep(2, 15),
col3 = rep(3, 15),
group = c(rep("A", 5), rep("B", 5), rep("C", 5)))
for(col in c("col1", "col2", "col3")){
filt.df <- df %>%
filter(group == "A") %>%
select(group, col)
# do other things, like ggplotting
}
如何使用 dplyr ?我知道我会在 base
R中使用类似 df [[col]]
的方法,但不熟悉该怎么做在 dplyr
中。
How can I iterate through a specific vector of columns using dplyr
? I know I would use something like df[[col]]
in base
R, but am unfamiliar with how to do it in dplyr
.
推荐答案
这应该可行。我使用select_()函数
this should work. I use the select_() function
library(dplyr)
df <- data.frame(col1 = rep(1, 15),
col2 = rep(2, 15),
col3 = rep(3, 15),
group = c(rep("A", 5), rep("B", 5), rep("C", 5)))
for(col in c("col1", "col2", "col3")){
filt.df <- df %>%
filter(group == "A") %>%
select_(.dots = c('group', col))
# do other things, like ggplotting
print(filt.df)
}
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