when uploading csv file to R, the file.csv should save as".csv" from".
xls",if u just modify suffix of files, files cannot be read .
BTW,who know the problem i meet, "strsplit(txt$Sentence,"，|。|！|？|、")" how to
understand this order~
> txt=read.csv("1988.csv",colClasses="character")
> sentences=strsplit(txt$Sentence,"，|。|！|？|、")
Error in strsplit(txt$Sentence, "，|。|！|？|、") :
non-character argument
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