我想使用Wordcloud功能对Twitter数据进行云图。我已经安装了Twitter软件包并正在使用API。之后,我按照以下步骤操作。
bigdata <- searchTwitter("#bigdata", n=20)
bigdata_list <- sapply(bigdata, function(x) x$getText())
bigdata_corpus <- Corpus(VectorSource(bigdata_list))
bigdata_corpus <- tm_map(bigdata_corpus, content_transformer(tolower), lazy=TRUE)
bigdata_corpus <- tm_map(bigdata_corpus, removePunctuation, lazy=TRUE)
bigdata_corpus <- tm_map(bigdata_corpus,
function(x)removeWords(x,stopwords()), lazy=TRUE)
wordcloud(bigdata_corpus)
这会导致Wordcloud命令产生错误信息:
Error in UseMethod("meta", x) :
no applicable method for 'meta' applied to an object of class "try-error"
In addition: Warning messages:
1: In mclapply(x$content[i], function(d) tm_reduce(d, x$lazy$maps)) :
all scheduled cores encountered errors in user code
2: In mclapply(unname(content(x)), termFreq, control) :
all scheduled cores encountered errors in user code
我尝试了不同的语料库命令,但似乎都无法正确执行。有什么想法吗?