R 什么'；it’这个语料库中的文本是小写的，我怎样才能把它变成大写呢？

我试图在

R

中构建一个单词云，但它只返回小写文本

sheet <- read_excel('list_products.xls', skip = 4)
products <- c(sheet$Cod)
products <- Corpus(VectorSource(products))
c_words <- brewer.pal(8, 'Set2')
wordcloud(products, min.freq = 10, max.words = 30, scale = c(7,1), colors = c_words)

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sheet正如您在这里看到的：，当您执行
TermDocumentMatrix（CORPUS）
时，默认情况下，单词是小写的。
事实上，如果您在没有参数
freq
的情况下进行
trace（wordcloud）
，
tdm感谢您做出如此清晰的指示。我很抱歉没有提供足够的内容来复制我的代码。
products <- tm_map(products, content_transformer(toupper))

filePath <- "http://www.sthda.com/sthda/RDoc/example-files/martin-luther-king-i-have-a-dream-speech.txt" # I am using this text because you DID NOT PROVIDED A REPRODUCIBLE EXAMPLE
text <- readLines(filePath)
products <- Corpus(VectorSource(text))
products <- tm_map(products, toupper)
c_words <- brewer.pal(8, 'Set2')
tdm <- tm::TermDocumentMatrix(products, control = list(tolower = F))
freq_corpus <- slam::row_sums(tdm)
wordcloud(names(freq_corpus), freq_corpus, min.freq = 10, max.words = 30, scale = c(7,1), colors = c_words)

filePath <- "http://www.sthda.com/sthda/RDoc/example-files/martin-luther-king-i-have-a-dream-speech.txt"
text <- readLines(filePath)
products <- Corpus(VectorSource(text))
products <- tm_map(products, toupper)
c_words <- brewer.pal(8, 'Set2')
wordcloud(names(freq_corpus), freq_corpus, min.freq = 10, max.words = 30, scale = c(7,1), colors = c_words)