BasisLIB is a test set of linear equations arising from linear programming problems. The test set was generated by Daniel Steffy and William Cook using the QSopt_ex software package. QSopt_ex is a rational precision linear programming solver developed by David Applegate, William Cook, Sanjeeb Dash and Daniel Espinoza. It is avaliable for download at http://www2.isye.gatech.edu/~wcook/qsopt/ex/ The LP problems have been gathered for several places including: NETLIB: http://www.netlib.org/lp/ MIPLIB 3.0: http://www.caam.rice.edu/~bixby/miplib/miplib.html MIPLIB 2003: http://miplib.zib.de/ Meszaros: http://www.sztaki.hu/~meszaros/public_ftp/lptestset/ Mittelmann: http://plato.asu.edu/ftp/lptestset/ TSPLIB: http://www.iwr.uni-heidelberg.de/groups/comopt/software/TSPLIB95/ Many of the instances can also be found in the GAMS Performance Library: http://www.gamsworld.org/performance/performlib.htm