.. _fwflag_n:
======
-n
======
Switch
======

-n N [N2 ...]

Description
===========

The value(s) of *n* to use when extracting n-gram features with :doc:`fwflag_add_ngrams`/:doc:`fwflag_add_ngrams_from_tokenized`. Aliased as ``--set_n``.

Argument and Default Value
==========================

One or more integers. Default: ``[1]`` (unigrams only).

Details
=======

Verified: ``dlatkInterface.py -d dla_tutorial -t msgs -c user_id --add_ngrams -n 1 2 3`` creates ``feat$1gram$...``, ``feat$2gram$...``, and ``feat$3gram$...`` tables, one per value of ``-n``. Combine with :doc:`fwflag_combine_feat_tables` to also produce a single merged table across all of them (e.g. a ``1to3gram`` table).

Other Switches
==============

Required Switches:

* :doc:`fwflag_add_ngrams` or :doc:`fwflag_add_ngrams_from_tokenized`

Optional Switches:

* :doc:`fwflag_combine_feat_tables`

Example Commands
================

.. code-block:: bash

	dlatkInterface.py -d dla_tutorial -t msgs -c user_id --add_ngrams -n 1 2 3 --combine_feat_tables 1to3gram