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It is often important to have interesting data to feed your algorithms,
to serve as test data to ensure correctness or to compare different
algorithms for raw speed.
Finding good test data can be surprisingly difficult.
Here are some pointers:

Combinatorica graphs  A modest collection of graphs is
available from the Combinatorica ftp site.
Particularly interesting are the 190 graphs of
Graffiti [Faj87], a program that formulated conjectures
in graph theory by studying the properties of these graphs.
See Section for more information on Combinatorica.

TSPLIB 
This wellrespected library of test instances for the traveling
salesman problem is available from Netlib (see Section )
and by anonymous ftp from softlib.cs.rice.edu.
TSPLIB instances are large, realworld graphs, derived from applications
such as circuit boards and networks.

Stanford GraphBase 
Discussed in Section , this suite of programs by Knuth
provides portable generators for a wide variety of graphs.
These include graphs arising from distance matrices, arts, and literature,
as well as graphs of more theoretical interest.

DIMACS Challenge data 
A series of DIMACS Challenge workshops have focused on evaluating
algorithm implementations of graph, logic, and data structure problems.
Instance generators for each problem have been developed, with the focus
on constructing difficult or representative test data.
The products of the DIMACS Challenges are available from
http://dimacs.rutgers.edu/.

Algorithm Repository 
The Algorithm Repository WWW site, http://www.cs.sunysb.edu/ algorith (and enclosed CDROM)
contain data sources for a few of the implementation challenge exercises.
In particular, we provide an airline routes data set, and a collection of
names labeled by ethnicity.
Algorithms
Mon Jun 2 23:33:50 EDT 1997