# OR-Library

OR-Library is a collection of test data sets for a variety of OR problems.

A full list of the test data sets available in OR-Library can be found
here.

## Bin packing - one-dimensional

There are currently 8 data files.
These files contain the instances of the bin packing problem considered in
E.Falkenauer (1994) "A Hybrid Grouping Genetic Algorithm for Bin Packing"
Working paper CRIF Industrial Management and Automation, CP 106 - P4, 50
av. F.D.Roosevelt, B-1050 Brussels, Belgium, email: efalkena@ulb.ac.be.
These data files are binpack1, binpack2, ..., binpack8 and were
contributed by E. Falkenauer.
The format of these data files is as follows:
Number of test problems (P)
For each test problem (p=1,...,P) in turn:
Problem identifier
Bin capacity, Number of items (n), Number of bins in the current
best known solution
For each item i (i=1,...,n): size of the item
There are 2 classes of bin packing instances. The first class, files
binpack1 to binpack4 (problem identifiers beginning with 'u') consists of
items of sizes uniformly distributed in (20,100) to be packed into bins of
size 150.
The second class, files binpack5 to binpack8 (problem identifiers beginning
with 't') consists of 'triplets' of items from (25,50) to be packed into
bins of size 100.
For the 'uniform' class, the value for "Number of bins in the current best
known solution" is the one found by algorithm in the above-referenced
paper. Except for problems u120_08, u120_19, u250_07, u250_12 and u250_13,
this is also the smallest number of bins capable of accommodating all the
items, so the value is the proven optimum.
For the 'triplets' class, the instances were constructed with a known
global optimum of n/3 bins, i.e. the guaranteed optimal solution has
exactly three items per bin.
Acknowledgement: Although the procedure of generating 'triplets' of a known
optimum is due to Falkenauer, Andre van Vliet from the Econometric
Institute, Erasmus University Rotterdam, has first suggested the idea of
instances of that nature.
The largest file is binpack4 of size 60Kb (approximately).
The entire set of files is of size 200Kb (approximately).

Click here
to access these files

OTHER SOURCES

Other bin packing test problems can be found
here
see also here