read.table() 和 read.csv 都在 Rmd 中出错

Question

我想在 Rmd 中读取 txt

---
title: "Untitled"
output: html_document
---
```{r}
country <- read.table("country.txt")
country
```

它显示错误:

processing file: Preview-2878539db5c7.Rmd

Quitting from lines 6-8 (Preview-2878539db5c7.Rmd) 
Error in file(file, "rt") : cannot open the connection
Calls: <Anonymous> ... withCallingHandlers -> withVisible -> eval -> eval -> read.table -  > file
Execution halted

但是我可以在 R 控制台中成功运行代码

> country <- read.table("country.txt")

> country
     production1 education1     fir1 inflation1 lq1 nonstatein1 patent1     tax1   trade1
2001    52920.47   132649.4 2.339263   0.700000  NA    19562.16  109313 23783.07 23783.07
2002    65876.57   144090.3 2.500826  -0.800000  NA    24727.30  131972 27479.61 27479.61
2003    89227.20   156280.4 2.691411   1.168900  NA    34044.45  164611 31537.50 31537.50
2004    92656.06   167683.7 2.615238   3.878600  NA    45613.10  177364 36179.87 36179.87
2005   167115.37   171379.7 2.617289   1.810000  NA    77525.52  231570 42008.37 42008.37
2006   218827.79   181084.6 2.578939   1.467800  NA    77441.52  282315 54866.43 54866.43
2007   286691.88   192677.9 2.439093   4.772700  NA    99032.26  333059 66453.31 66453.31
2008   364955.86   202542.8 2.440807   5.864570  NA   124621.23  418524 74104.80 74104.80
2009   398476.09   213539.2 3.783803  -0.693900  NA   153670.18  537957 65501.69 65501.69
2010   511364.93   254805.1 3.806066   3.322200  NA   194286.94  700304 81966.57 81966.57
2011   624657.55   279690.7 2.862413   5.393433  NA   229513.81  997132 91118.75 91118.75

该文件存在于 wd

> file.exists("country.txt")
[1] TRUE

我也尝试使用 read.csv()
但它显示类似的错误:

processing file: Preview-28786aad2e0.Rmd

Quitting from lines 6-8 (Preview-28786aad2e0.Rmd) 
Error in file(file, "rt") : cannot open the connection
Calls: <Anonymous> ... withVisible -> eval -> eval -> read.csv -> read.table -> file
Execution halted

Answer 1

简短的回答是:

KNOW THY getwd()

不要将当前 R 控制台的工作目录与 R Markdown 文档的工作目录(即此 R Markdown 文档的目录)混淆。如有疑问，请打印 getwd()您想知道您的工作目录的位置(例如在 *.Rmd 中)。注意 R Markdown 文档在单独的 R session 中编译以增强可重复性，因此您当前的 R 控制台与 R Markdown 文档的编译无关。