我運行下面的代碼和接收錯誤.jcall():R |錯誤
Error in .jcall("RWekaInterfaces", "[S", "tokenize", .jcast(tokenizer, : java.lang.NullPointerException
setwd("C:\\Users\\jbarr\\Desktop\\test)
library (tm); library (wordcloud);library (RWeka); library (tau);library(xlsx);
Comment <- read.csv("testfile.csv",stringsAsFactors=FALSE)
str(Comment)
review_source <- VectorSource(Comment)
corpus <- Corpus(review_source)
corpus <- tm_map(corpus, removePunctuation)
corpus <- tm_map(corpus, removeNumbers)
corpus <- tm_map(corpus, stripWhitespace)
corpus <- tm_map(corpus, removeWords,stopwords(kind = "english"))
corpus <- tm_map(corpus, content_transformer(tolower))
corpus <- tm_map(corpus, removeWords, c("member", "advise", "inform", "informed", "caller", "call","provided", "advised"))
dtm <- DocumentTermMatrix(corpus)
dtm2 <- as.matrix(dtm)
wordfreq <- colSums(dtm2)
wordfreq <- sort(wordfreq, decreasing=TRUE)
head(wordfreq, n=100)
wfreq <- head(wordfreq, 500)
set.seed(142)
words <- names(wfreq)
dark2 <- brewer.pal(6, "Dark2")
wordcloud(words[1:100], wordfreq[1:100], rot.per=0.35, scale=c(2.7, .4), colors=dark2, random.order=FALSE)
write.xlsx(wfreq, "C:\\Users\\jbarr\\Desktop\\test")
有趣的問題是,我已經跑了多個文件的代碼,並且只有特定的人有錯誤。
請讓我知道您的想法。謝謝!
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@MartinEvans但邏輯很好。 –