在字符变量中插入换行符

Question

在 R 中将换行符插入 char-Variable 的最优雅的方式是什么？

例如我有以下data.frame：

longValues <- c("This is a very long text that should include linebreaks", "And also this is a very long text, that should include linereaks", "And this is an even longer text without linebreaks")
df <- data.frame(longValues)
df

我想创建一个包含与longValues 相同值的新变量，但应在一定数量的字符（假设为 20）之后插入换行符（“\n”），但应在两个字符之间插入字。因此，如果 20. 字符位于某个单词中，则换行符应位于该单词之后。

结果应该是这样的：

df$linebreaks <- c("This is a very long\n 
                 text that should include\n
                 linebreaks", 
                "And also this is a very
                long text, that should\n 
                include linereaks", 
                "And this is an even \n
                longer text without \n
                linebreaks")

Answer 1

stringr::str_wrap 将完成这项工作：

library(stringr)
str_wrap(df$longValues, width = 20)

#> [1] "This is a very long\ntext that should\ninclude linebreaks"          
#> [2] "And also this is\na very long text,\nthat should include\nlinereaks"
#> [3] "And this is an even\nlonger text without\nlinebreaks"