R“for loop”错误讯息{} [英] R "for loop" error messages {}

问题描述

由于几天前我在R中运行for循环，它给了我很多与}相关的错误。它只发生在我突出显示整个代码并运行它。如果我一行一行地执行，那么它运行得很好。

Since a couple of days ago when I run a for loop in R it gives me plenty of errors related to "}". It only happens if I highlight the whole code and run it. If i execute it line by line, then it runs just fine.

我尝试了最基本的循环：

I tried even with the most basic loop:

foo <- seq(1, 100, by=2)
foo.squared <- NULL
for (i in 1:50 ) {
foo.squared[i] <- foo[i]^2
}

这是控制台：

> foo <- seq(1, 100, by=2)
"rror: unexpected input in "foo <- seq(1, 100, by=2)
> foo.squared <- NULL
"rror: unexpected input in "foo.squared <- NULL
> for (i in 1:50 ){
"rror: unexpected input in "for (i in 1:50 ){
> foo.squared[i] <- foo[i]^2
"rror: unexpected input in " foo.squared[i] <- foo[i]^2
> }
Error: unexpected '}' in "}"
> 

R会话的详细信息（我在RStudio中运行）：

Details of the R session (I run it in RStudio):

> sessionInfo()
R version 3.0.2 (2013-09-25)
Platform: x86_64-apple-darwin10.8.0 (64-bit)

一直非常讨厌！我会感谢任何建议！
谢谢，
Maria

It has been very annoying!! I would appreciate any advice!!! Thanks, Maria

更新：

开始我怀疑导致这个问题。它应该采取一个名称的向量，并从中提取第二个元素。

Here is the code in the very beginning that I suspect causes this problem..It is supposed to take a vector of names and extract the second element from it.

splitnames <- strsplit(as.character(train$Name),"[,.]")
firstelement <- function(x){x[2]}
sapply(splitnames,firstelement)

执行后，R动作很奇怪。虽然我不是100％肯定的。

After I execute it R acts weird. Though I am not 100% sure.

推荐答案

我遇到了同样的问题，并发现它是由RStudio中的一个错误引起的（代码运行良好在R和R-gui中，但是在RStudio中失败。）在RStudio的保存状态中的某些事情被破坏之前很难再现，之后行为是非常一致的。

I have been experiencing the same problem, and have found that it is caused by a bug in RStudio (the code runs fine in R and R-gui, but fails in RStudio.) It is hard to reproduce until something gets corrupted in RStudio's saved state, after which the behaviour is pretty consistent.

删除〜/ .rstudio-desktop 修复了我的问题。

mv ~/.rstudio-desktop ~/rstudio-desktop.old

更多关于重新设置RStudio的各种状态平台 here。

More on resetting RStudio's state on various platforms here.

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