How to Write a Spelling Correction Program

This is an excellent article by Peter Norvig, a research director of Google.

Emacs — Tab vs. Space

To force Emacs to insert spaces instead of tabs when you press the TAB key:

M-x set-variable indent-tabs-mode nil

Or in your .emacs file:

(setq-default indent-tabs-mode nil)

C++ digraphs and additional keywords

[Original post]

A digraph is a keyword or combination of keys that lets you produce a character that is not available on all keyboards.

The digraph key combinations are:

Key Combination	Character Produced
<%	{
%>	}
<:	[
:>	]
%%	#

Additional keywords, valid in C++ programs only, are:

Keyword	Character Produced
bitand	&
and	&&
bitor	|
or	||
xor	^
compl	~
and_eq	&=
or_eq	|=
xor_eq	^=
not	!
not_eq	!=

To Make Firefox Display PDF on Mac OS X

On Windows, we can simply install Adobe Reader and Firefox will be able to find PDF plugin. However, on Mac OS X, we need to install the PDF Browser Plugin from Schubert|it.

VLHMM for Web Applications

It is glad to find that a WWW'09 paper cited my work on VLHMM (variable-length hidden Markov model). In this paper, Towards Context-Aware Search by Learning a Very Large Variable Length Hidden Markov Model from Search Logs, the authors propose to learn a very-large VLHMM for Web user behavior modeling. I also re-visited my old Web page on VLHMM.

Merge columns from two text files

pr -m -t -s\ file1 file2

Posting Code into Blogger Posts

A concise article describes how to use SyntaxHighLighter to insert program code snippets into Blogger posts.