R-更改数据框中列的编码？

Question

我正在尝试更改数据框中列的编码。

stri_enc_mark(data_updated$text)
#   [1] "UTF-8" "ASCII" "ASCII" "UTF-8" "ASCII" "ASCII" "UTF-8" "UTF-8" "UTF-8"
#  [10] "ASCII" "ASCII" "UTF-8" "ASCII" "UTF-8" "ASCII" "UTF-8" "ASCII" "UTF-8"
#  [19] "ASCII" "UTF-8" "ASCII" "UTF-8" "ASCII" "UTF-8" "UTF-8" "ASCII" "ASCII"
#  [28] "ASCII" "ASCII" "UTF-8" "ASCII" "ASCII" "ASCII" "UTF-8" "UTF-8" "ASCII"

当我尝试转换它时，它没有抛出错误，但对向量仍然没有影响：

d <- enc2utf8(data_updated$text)
stri_enc_mark(d)
#   [1] "UTF-8" "ASCII" "ASCII" "UTF-8" "ASCII" "ASCII" "UTF-8" "UTF-8" "UTF-8"
#  [10] "ASCII" "ASCII" "UTF-8" "ASCII" "UTF-8" "ASCII" "UTF-8" "ASCII" "UTF-8"
#  [19] "ASCII" "UTF-8" "ASCII" "UTF-8" "ASCII" "UTF-8" "UTF-8" "ASCII" "ASCII"
#  [28] "ASCII" "ASCII" "UTF-8" "ASCII" "ASCII" "ASCII" "UTF-8" "UTF-8" "ASCII"

有什么建议吗？

我在 Windows 7、32 位。添加数据片段。

> Encoding(data_updated$text[1:35])
 [1] "UTF-8"   "unknown" "unknown" "UTF-8"   "unknown" "unknown" "UTF-8"  
 [8] "UTF-8"   "UTF-8"   "unknown" "unknown" "UTF-8"   "unknown" "UTF-8"  
[15] "unknown" "UTF-8"   "unknown" "UTF-8"   "unknown" "UTF-8"   "unknown"
[22] "UTF-8"   "unknown" "UTF-8"   "UTF-8"   "unknown" "unknown" "unknown"
[29] "unknown" "UTF-8"   "unknown" "unknown" "unknown" "UTF-8"   "UTF-8"

数据看起来像这样。

> data_updated$text[1:35]
 [1] "RT @satpalpandey: Majlis started in Sirsa Ashram.\nInform others too.\nLive @ http://t.co/zGXWATGajX\nIVR Airtel 55252\nReliance 56300403\n\n#MSG…"
 [2] "Deal Talks for Here Mapping Service Expose Reliance on Location Data, via @nytimes #mapping #dilemma  http://t.co/wGdiS5OlRq"                      
 [3] "http://t.co/UZIyX1Rk7W The popping linksexploaded!! http://t.co/KpNntm1dH7 :) http://t.co/oku91uVxZ8"                                              
 [4] "RT @davidsunaria90: Wtch LIVE Mjlis Now\n http://t.co/GXNhe3eY7Y\nIVR Airtel: 55252\nReliance: 56300403\nYoutube Link : http://t.co/YewOVcz8bb\n…" 
 [5] "Reliance Jio Infocomm: Indian carrier raises 0 million loan for 4G rollout  http://t.co/B2aWlkmwXz"                                             
 [6] "RT @SurjeetInsan: Majlis started in Sirsa Ashram.\nLive @ http://t.co/PR6W5tzZes\nIVR Airtel 55252\nReliance 56300403\n\n#MSGPlsSaveTheEarth"      
 [7] "\"Deal Talks for Here Mapping Service Expose Reliance on Location Data\" by MARK SCOTT and MIKE ISAAC via NYT Techno… http://t.co/kyxTYIxks5"      
 [8] "RT @satpalpandey: Majlis started in Sirsa Ashram.\nInform others too.\nLive @ http://t.co/zGXWATGajX\nIVR Airtel 55252\nReliance 56300403\n\n#MSG…"
 [9] "RT @jaameinsan: Watch LIVE Majlis Now\n http://t.co/nPQegnLXPa\nIVR Airtel: 55252\nReliance: 56300403\nYoutube Link : http://t.co/txXMtw3zFP\n#M…" 
[10] "\"Deal Talks for Here Mapping Service Expose Reliance on Location Data\" by MARK SCOTT and MIKE ISAAC via NYT Technology"

这些是推文，我认为 "http://" 链接在此处指示编码，因为它们具有 "wGdiS5OlRq" 之类的表达式。为了进行分析，我使用正则表达式删除了这些标签。但是要将原始数据存储在数据库中，我需要这些推文。 MongoDB 没有问题，但 RDBMS 会引发问题。

Answer 1

看来我们可以在将向量转换为Factor然后再转换回字符向量之后使用conv()函数来转换编码。说实话有点奇怪

Answer 2

以防有人仍然卡住：我使用了 Encoding()。

  for (col in colnames(mydataframe)){
  Encoding(mydataframe[[col]]) <- "UTF-8"}

Answer 3

我发现 stringi::stri_enc_toascii() 非常有用，可以解决我的问题。

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