how to use stemDocument in R?

Question

update:

Thanks for help. Check comments. Because of package version, I delete the tolower and it works. I just need to find another way to make it lower.

==

Answer 1

This problem appears in tm 0.6 and has to do with using functions that are not in the list of getTransformation() from tm. The problem is that tolower just returns a character vector, and not a "PlainTextDocument" like tm_map would like. The tm packages provides the content_transformer function to take care of managing the PlainTextDocument

fbCorpus  <- tm_map(fbCorpus, content_transformer(tolower))

Answer 2

I had the same problem.

If you look at the arguments for stemDocuments you can specify the language of stemming. I found by specifying "English" it solved the problem for me.

stemDocument(language="english")

Answer 3

You are not loading you document correctly. If you have your data in x.csv file then use following:

      > x <- read.csv(file_loc, header = TRUE) // where file_loc is the path to the csv file
      > x <- data.frame(lapply(x, as.character), stringsAsFactors=FALSE)

     > require(tm)
         Loading required package: tm

     > dd <- Corpus(DataframeSource(x))

      > inspect(dd)

Then simply use stemDocument like below:

  fbCorpus <- tm_map(fbCorpus, stemDocument)