A simple example for the usage of the tm package

The following makes use of the tm package. You may need to install it from CRAN using the code install.packages("tm") if you want to run this on your computer. (The package is already installed on the notebook container, however.)


# Activating the 'tm' package
library(tm)
Loading required package: NLP


# We activate the 'acq' data, a corpus of 50 example news articles
data(acq)
acq
<<VCorpus>>
Metadata:  corpus specific: 0, document level (indexed): 0
Content:  documents: 50

# We take a look at the first element in the corpus, a text document:
class(acq[[1]])
[1] "PlainTextDocument" "TextDocument"

acq[[1]]
<<PlainTextDocument>>
Metadata:  15
Content:  chars: 1287

inspect(acq[[1]])
<<PlainTextDocument>>
Metadata:  15
Content:  chars: 1287

Computer Terminal Systems Inc said
it has completed the sale of 200,000 shares of its common
stock, and warrants to acquire an additional one mln shares, to
<Sedio N.V.> of Lugano, Switzerland for 50,000 dlrs.
    The company said the warrants are exercisable for five
years at a purchase price of .125 dlrs per share.
    Computer Terminal said Sedio also has the right to buy
additional shares and increase its total holdings up to 40 pct
of the Computer Terminal's outstanding common stock under
certain circumstances involving change of control at the
company.
    The company said if the conditions occur the warrants would
be exercisable at a price equal to 75 pct of its common stock's
market price at the time, not to exceed 1.50 dlrs per share.
    Computer Terminal also said it sold the technolgy rights to
its Dot Matrix impact technology, including any future
improvements, to <Woodco Inc> of Houston, Tex. for 200,000
dlrs. But, it said it would continue to be the exclusive
worldwide licensee of the technology for Woodco.
    The company said the moves were part of its reorganization
plan and would help pay current operation costs and ensure
product delivery.
    Computer Terminal makes computer generated labels, forms,
tags and ticket printers and terminals.
 Reuter

# We take a look at the document metadata
meta(acq[[1]])
  author       : character(0)
  datetimestamp: 1987-02-26 15:18:06
  description  :
  heading      : COMPUTER TERMINAL SYSTEMS <CPML> COMPLETES SALE
  id           : 10
  language     : en
  origin       : Reuters-21578 XML
  topics       : YES
  lewissplit   : TRAIN
  cgisplit     : TRAINING-SET
  oldid        : 5553
  places       : usa
  people       : character(0)
  orgs         : character(0)
  exchanges    : character(0)

DublinCore(acq[[1]])
  contributor: character(0)
  coverage   : character(0)
  creator    : character(0)
  date       : 1987-02-26 15:18:06
  description:
  format     : character(0)
  identifier : 10
  language   : en
  publisher  : character(0)
  relation   : character(0)
  rights     : character(0)
  source     : character(0)
  subject    : character(0)
  title      : COMPUTER TERMINAL SYSTEMS <CPML> COMPLETES SALE
  type       : character(0)

Downloadable R script and interactive version

Explanation

The link with the “jupyterhub” icon directs you to an interactive Jupyter1 notebook, which runs inside a Docker container2. There are two variants of the interative notebook. One shuts down after 60 seconds and does not require a sign it. The other requires sign in using your ORCID3 credentials, yet shuts down only after 24 hours. (There is no guarantee that such a container persists that long, it may be shut down earlier for maintenance purposes.) After shutdown all data within the container will be reset, i.e. all files created by the user will be deleted.4

Above you see a rendered version of the Jupyter notebook.5

1

For more information about Jupyter see http://jupyter.org. The Jupyter notebooks make use of the IRKernel package.

2

For more information about Docker see https://docs.docker.com/. The container images were created with repo2docker, while containers are run with docker spawner.

3

ORCID is a free service for the authentication of researchers. It also allows to showcase publications and contributions to the academic community such as peer review.. See https://info.orcid.org/what-is-orcid/ for more information.

4

The Jupyter notebooks come with NO WARRANTY whatsoever. They are provided for educational and illustrative purposes only. Do not use them for production work.

5

The notebook is rendered with the help of the nbsphinx extension.