tm.plugin.mail (version 0.2-2)

threads: E-Mail Threads

Description

Extract threads (i.e., chains of messages on a single subject) from e-mail documents.

Usage

threads(x)

Value

A list with the two named components ThreadID and

ThreadDepth, listing a thread and the level of replies for each mail in the corpus x.

Arguments

x

A corpus consisting of e-mails (MailDocuments).

Details

This function uses a one-pass algorithm for extracting the thread information by inspecting the “References” header. Some mails (e.g., reply mails appearing before their corresponding base mails) might not be tagged correctly.

Examples

require("tm")
newsgroup <- system.file("mails", package = "tm.plugin.mail")
news <- VCorpus(DirSource(newsgroup),
                readerControl = list(reader = readMail))
vapply(news, meta, "id", FUN.VALUE = "")
lapply(news, function(x) meta(x, "header")$References)
(info <- threads(news))
lengths(split(news, info$ThreadID))