如何处理/摆脱表情符号，以便我可以对推文进行排序以进行情感分析？
得到：
sort.list(y) 中的错误：
输入无效
Thanks
这就是从 twitter 到 r 的表情符号的显示方式：
\xed��\xed�\u0083\xed��\xed��
\xed��\xed�\u008d\xed��\xed�\u0089
这应该摆脱表情符号，使用iconv正如恩杜根所建议的。
一些可重现的数据：
require(twitteR)
# note that I had to register my twitter credentials first
# here's the method: http://stackoverflow.com/q/9916283/1036500
s <- searchTwitter('#emoticons', cainfo="cacert.pem")
# convert to data frame
df <- do.call("rbind", lapply(s, as.data.frame))
# inspect, yes there are some odd characters in row five
head(df)
text
1 ROFLOL: echte #emoticons [humor] http://t.co/0d6fA7RJsY via @tweetsmania ;-)
2 “@teeLARGE: when tmobile get the iphone in 2 wks im killin everybody w/ emoticons & \nall the other stuff i cant see on android!" \n#Emoticons
3 E poi ricevi dei messaggi del genere da tua mamma xD #crazymum #iloveyou #emoticons #aiutooo #bestlike http://t.co/Yee1LB9ZQa
4 #emoticons I want to change my name to an #emoticon. Is it too soon? #prince http://t.co/AgmR5Lnhrk
5 I use emoticons too much. #addicted #admittingit #emoticons <ed><U+00A0><U+00BD><ed><U+00B8><U+00AC><ed><U+00A0><U+00BD><ed><U+00B8><U+0081> haha
6 What you text What I see #Emoticons http://t.co/BKowBSLJ0s
这是删除表情符号的关键行：
# Clean text to remove odd characters
df$text <- sapply(df$text,function(row) iconv(row, "latin1", "ASCII", sub=""))
现在再次检查，看看奇数字符是否消失了（参见第 5 行）
head(df)
text
1 ROFLOL: echte #emoticons [humor] http://t.co/0d6fA7RJsY via @tweetsmania ;-)
2 @teeLARGE: when tmobile get the iphone in 2 wks im killin everybody w/ emoticons & \nall the other stuff i cant see on android!" \n#Emoticons
3 E poi ricevi dei messaggi del genere da tua mamma xD #crazymum #iloveyou #emoticons #aiutooo #bestlike http://t.co/Yee1LB9ZQa
4 #emoticons I want to change my name to an #emoticon. Is it too soon? #prince http://t.co/AgmR5Lnhrk
5 I use emoticons too much. #addicted #admittingit #emoticons haha
6 What you text What I see #Emoticons http://t.co/BKowBSLJ0s
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