Dplyr或Magrittr？ [英] Dplyr or Magrittr - tolower?

问题描述

是否可以在dplyr或magrittr链中将所有列名称设置为高或低？

Is it possible to set all column names to upper or lower within a dplyr or magrittr chain?

在下面的示例中，我加载数据，然后使用magrittr管，链通过我的dplyr突变。在第四行中，我使用 tolower 函数，但这是一个不同的目的：创建一个带有小写观察值的新变量。

In the example below I load the data and then, using a magrittr pipe, chain it through to my dplyr mutations. In the 4th line I use the tolower function , but this is for a different purpose: to create a new variable with lowercase observations.

mydata <- read.csv('myfile.csv') %>%
    mutate(Year = mdy_hms(DATE),
           Reference = (REFNUM),
           Event = tolower(EVENT)

我显然正在寻找类似 colnames = tolower 的东西，但知道这不行/存在。

I'm obviously looking for something like colnames = tolower but know this doesn't work/exist.

我注意到dplyr 重命名函数，但这并不真正有用。

I note the dplyr rename function but this isn't really helpful.

在magrittr中，colname选项是：

In magrittr the colname options are:

set_colnames 而不是base R的 colnames< -

set_names 而不是base R的名称< -

set_colnames instead of base R's colnames<-
set_names instead of base R's names<-

我已经尝试了许多排列，但没有骰子。

I've tried numerous permutations with these but no dice.

显然，这在基础r中非常简单。

Obviously this is very simple in base r.

names(mydata) <- tolower(names(mydata))

然而，与 dplyr / magrittr 的哲学，你必须做一个笨重的一个班轮，然后再转到一个优雅的dplyr / magrittr代码链。

However it seems incongruous with the dplyr/magrittr philosophies that you'd have to do that as a clunky one liner, before moving on to an elegant chain of dplyr/magrittr code.

推荐答案

使用 magrittr 的复合分配管道操作符 code>％<>％可能是，如果我明白您的问题正确，一个更简洁的选择。

Using magrittr's "compound assignment pipe-operator" %<>% might be, if I understand your question correctly, an even more succinct option.

library("magrittr")
names(iris) %<>% tolower

?`%<>%` # for more

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