output_dtm: Convert or Write DTM/TDM Object Quickly
In chinese.misc: Miscellaneous Tools for Chinese Text Mining and More

Given a TermDocumentMatrix or DocumentTermMatrix object, the function converts it to a matrix or write it into a .csv file, with additional filenames attached to it.

1	output_dtm(x, outputfile = NULL, doc_name = NULL)

`x`	an object created by `tm::TermDocumentMatrix` or `tm::DocumentTermMatrix`.
`outputfile`	when it is NULL (default), no file is written and a matrix is returned. When a filename is provided, it will write the matrix into a file. The filename must end with ".csv".
`doc_name`	whether `NULL` or a character vector specifying the names you want to give to texts. If it is not a character vector, the function will try to coerce. Then the names become the row names of the returned matrix. Double inversed slashes will be converted to "/" by the function. The length of the argument must be equal to the number of files. `NA` element is not allowed. By default it is `NULL`, which means no name is added.

require(tm)
x <- c(
  "Hello, what do you want to drink?", 
  "drink a bottle of milk", 
  "drink a cup of coffee", 
  "drink some water")
dtm <- corp_or_dtm(x, from = "v", type = "dtm")
output_dtm(dtm, doc_name = paste("doc", 1:4))