逐行读取R中的文本文件 [英] Read a text file in R line by line

问题描述

我想使用for循环和文件的长度逐行读取R中的文本文件.问题在于它仅打印character(0).这是代码:

I would like to read a text file in R, line by line, using a for loop and with the length of the file. The problem is that it only prints character(0). This is the code:

fileName="up_down.txt"
con=file(fileName,open="r")
line=readLines(con) 
long=length(line)
for (i in 1:long){
    linn=readLines(con,1)
    print(linn)
}
close(con)

推荐答案

以下是带有for循环的解决方案.重要的是，它将readLines的一个调用从for循环中删除，这样就不会一次又一次地不正确地调用它.在这里:

Here is the solution with a for loop. Importantly, it takes the one call to readLines out of the for loop so that it is not improperly called again and again. Here it is:

fileName <- "up_down.txt"
conn <- file(fileName,open="r")
linn <-readLines(conn)
for (i in 1:length(linn)){
   print(linn[i])
}
close(conn)

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