-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 GLPK 4.13 -- Release Information ================================
Release date: November 13, 2006 GLPK (GNU Linear Programming Kit) is intended for solving large-scale linear programming (LP), mixed integer linear programming (MIP), and other related problems. It is a set of routines written in ANSI C and organized as a callable library. In this release: A tentative implementation of the primal two-phase simplex method based on exact (bignum) arithmetic was included in the package. On API level it is available through the routine lpx_exact, which is similar to the routine lpx_simplex. In the solver glpsol it is available through two new command-line options: --exact and --xcheck. If the '--exact' option is specified, glpsol solves LP instance using the exact simplex method; in case of MIP it is used to obtain optimal solution of LP relaxation. If the - --xcheck option is specified, LP instance (or LP relaxation) is solved using the standard (floating-point) simplex method, however, then glpsol calls the exact simplex routine to make sure that the final LP basis is exactly optimal, and if it is not, to perform some additional simplex iterations in exact arithmetic. GLPK has its own low-level routines implementing operations on integer and rational numbers that makes it independent on other software packages. However, to attain a much better performance it is highly recommended to install (before configuring GLPK) the GNU Multiple Precision Arithmetic Library (GMP); see http://www.swox.com/gmp/ . Using GMP library is able to make computations significantly faster. See GLPK web page at <http://www.gnu.org/software/glpk/glpk.html>. GLPK distribution can be ftp'ed from <ftp://ftp.gnu.org/gnu/glpk/> or from some mirror ftp sites; see <http://www.gnu.org/order/ftp.html>. MD5 check-sum is the following: d1e7142be353da423ee4662499813541 *glpk-4.13.tar.gz GLPK is also available as a Debian GNU/Linux package. See its web page at <http://packages.debian.org/stable/math/glpk.html>. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (MingW32) iD8DBQFFWJ0g0XvyMFmB6BgRAhTRAKCOUBn19ErhmA0b9jRHgK/MvJX8BgCeOtk0 RN5ooFHnC8LLNBZ1hyZqaj0= =a/uT -----END PGP SIGNATURE----- _______________________________________________ GNU Announcement mailing list <info-gnu@gnu.org> http://lists.gnu.org/mailman/listinfo/info-gnu
