readLines不明n [关闭]

Question

在gui（Windows gui或RStudio等）中时，我可以通过指定n=?从脚本中使用具有已知行数的readLines ，如下所示n=? 。 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）怎么办？ 如何在gui中使用readLines （从外部文件中的脚本读取）而不指定n？ 如果您不提供n，则显示readLines可以保持连接打开并保持在读取线上。 按下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

这是一个演示我要问的具体问题的视频 。

当张贴者以奇怪的格式（如下面的数据集）为您提供数据并且您想在不计入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

编辑直到重新打开，Dason才能回答自己...

戴森建议使用ctrl + z，并且这样做有效（至少在Windows计算机上）

Answer 1

两种简单的解决方案。

1. 将文本放入另一个文件，然后阅读。

2. 不要使用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textConnection引号，并创建textConnection以读取

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Windows环境中，选择并复制到剪贴板后：

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

在Mac / UNIX中：

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