readLines unknown n

Question

在gui中（无论是Windows gui还是RStudio等），我可以通过指定readLines从具有已知行数的脚本中使用n=?，如下所示。如果我不确定正在读取的行数（即，我有很多行并且不知道n），该怎么办？如何在不指定n的情况下在gui中使用readLines（从非外部文件中读取脚本）？如果您不提供n，则显示readLines保持连接打开并继续读取行。点击esc会停止该功能，但不会读取任何行。

x <- readLines(n=4)
** preparing package for lazy loading
** help
*** installing help indices
** building package indices

x

Here is a video演示我要问的具体问题。

当海报以奇怪的格式（如下面的设置）为您提供数据并且您想要在不计算所有行的情况下读取数据时，此功能特别有用：

** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** preparing package for lazy loading
** help
*** installing help indices
** building package indices

编辑直到重新开放，Dason才能自己回答......

Dason建议使用ctrl + z，这可行（至少在Windows机器上）

Answer 1

两个简单的解决方案。

1. 将文本放入另一个文件中，然后阅读。

2. 请勿使用readLines。引用文字：

x <- strsplit("** preparing package for lazy loading
** help
*** installing help indices
** building package indices
", "\n")


x
[[1]]
[1] "** preparing package for lazy loading" "** help"                               "*** installing help indices"          
[4] "** building package indices"          

Answer 2

您可以在文本周围加上引号并创建textConnection来阅读

text <- "** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** preparing package for lazy loading
** help
*** installing help indices
** building package indices"

readLines(textConnection(text))
# [1] "** preparing package for lazy loading" "** help"                              
# [3] "*** installing help indices"           "** building package indices"          
# [5] "** preparing package for lazy loading" "** help"                              
# [7] "*** installing help indices"           "** building package indices"          
# [9] "** preparing package for lazy loading" "** help"                              
#[11] "*** installing help indices"           "** building package indices"          
#[13] "** preparing package for lazy loading" "** help"                              
#[15] "*** installing help indices"           "** building package indices"          
#[17] "** preparing package for lazy loading" "** help"                              
#[19] "*** installing help indices"           "** building package indices"  

Answer 3

在选择并复制到剪贴板后的Windows环境中：

 (clip.input <- readLines( file("clipboard") ) )

在Mac / UNIX中：

 (clip.input <- readLines( pipe("pbpaste") ) )