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.
There are currently 15 data files. These data files are the test problems solved in J.E.Beasley "A heuristic for Euclidean and rectilinear Steiner problems", European Journal of Operational Research 58 (1992) 284-292. These data files include the 46 test problems from J.Soukup and W.F.Chow "Set of test problems for the minimum length connection networks" ACM/SIGMAP Newsletter 15 (1973) 48-51. The following table gives the relationship between test problems and the appropriate file. Number of points (n) File 10 estein10 20 estein20 30 estein30 40 estein40 50 estein50 60 estein60 70 estein70 80 estein80 90 estein90 100 estein100 250 estein250 500 estein500 1000 estein1000 10000 estein10000 The Soukup and Chow test problems are in data file estein1. The format of these data files is: number of test problems (m) for each test problem i (i=1,...,m) in turn: number of points (n) for each point j (j=1,...,n): x-coordinate, y-coordinate Optimal solution information for files estein1, estein10, ...,estein100 can be found in the files estein1opt, estein10opt, ...,estein100opt. These files were contributed by Martin Zachariasen of the University of Copenhagen (email email@example.com) and were found using the algorithm described in "Large Euclidean Steiner minimal trees in an hour" by P. Winter and M. Zachariasen, available here The format of these files is: number of test problems (m) for each test problem i (i=1,...,m) in turn: optimal steiner solution value minimal spanning tree solution value number of Steiner points (S) for each Steiner point s (s=1,...,S): x-coordinate, y-coordinate The largest file is estein1000 of size 350Kb (approximately). The entire set of files is of size 1100Kb (approximately).
Click here to access these files