Question

我正在从HDFS的mapper代码（R代码）中逐行阅读一些文本。文字如下：

input <- file("stdin", "r")

while(length(line <- readLines(input, n=1, warn=FALSE)) > 0)
{
}
close(input)

用于读取循环的代码是：

^A

在上面的文字中，我有\N作为我的字段分隔符，^A存在一些空白（R＆＃39; s NA）。我能够使用\001分隔\N（不知道它是如何工作的？）。但我在替换\\N时遇到了问题。我尝试过以下建议： remove all line breaks (enter symbols) from the string using R还有一些;但没有任何作用。我也试过"15059773" "3872" NA "2015-09-05" NA "2015-09-01" "3" "0" "0" NA "shirts adult male" "xl" NA "5183656" "c1 13 me ult tee c" "blue" "watersport blue" NA NA NA "0" NA "3" "mn" "45.05273" "-93.365555" "100" "131" "27.0" "13.0" "8.0" "85.0" "57.0" "21.0" "1012.0" "0" "0" "1" "0" "43" "3" "4"，但也没有工作。

当我逐行处理这个时，我对第一行的预期输出是：

const string AutorunRegistryKey = @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run";
Registry.SetValue(AutorunRegistryKey, <AppName>, <PathToApplication>);

Answer 1

这似乎有效：

ifelse(strsplit(string, "\\^A")[[1]] == "\\N", NA, strsplit(string, "\\^A")[[1]])
 [1] "15059773"           "3872"               NA                   "2015-09-05"         NA                  
 [6] "2015-09-01"         "3"                  "0"                  "0"                  NA                  
[11] "shirts adult male"  "xl"                 NA                   "5183656"            "c1 13 me ult tee c"
[16] "blue"               "watersport blue"    NA                   NA                   NA                  
[21] "0"                  NA                   "3"                  "mn"                 "45.05273"          
[26] "-93.365555"         "100"                "131"                "27.0"               "13.0"              
[31] "8.0"                "85.0"               "57.0"               "21.0"               "1012.0"            
[36] "0"                  "0"                  "1"                  "0"                  "43"                
[41] "3"                  "4"

数据：

cat(string) 15059773^A3872^A\N^A2015-09-05^A\N^A2015-09-01^A3^A0^A0^A\N^Ashirts adult male^Axl^A\N^A5183656^Ac1 13 me ult tee c^Ablue^Awatersport blue^A\N^A\N^A\N^A0^A\N^A3^Amn^A45.05273^A-93.365555^A100^A131^A27.0^A13.0^A8.0^A85.0^A57.0^A21.0^A1012.0^A0^A0^A1^A0^A43^A3^A4

删除＆＃34; \ N＆＃34;从字符串读取文件连接R

1 个答案: