A MIP presolver were implemented (currently incomplete). It is
used internally in the routine lpx_intopt (see below).
An advanced branch-and-bound solver (the routine lpx_intopt)
were implemented.
The routine lpx_check_int to check MIP feasibility conditions
was added.
The routine lpx_print_mip was changed to print MIP feasibility
conditions.
The built-in functions sin, cos, atan, and atan2 were added to
the MathProg language.
Some typos were fixed.
Thanks to Minh Ha Duong <haduong@centre-cired.fr> (CIRED, CNRS).
Core simplex method and interior-point method routines were
re-implemented and now they use a new, "storage-by-rows" sparse
matrix format (unlike previous versions where linked lists were
used to represent sparse matrices). For details see ChangeLog.
Also a minor bug was fixed in API routine lpx_read_cpxlp.
Now GLPK supports free MPS format. Two new API routines
lpx_read_freemps (to read problem data in free MPS format) and
lpx_write_freemps (to write problem data in free MPS format)
were added. This feature is also available in the solver glpsol
via new command-line options --freemps and --wfreemps. For more
details see the GLPK reference manual.
API routines lpx_read_cpxlp and lpx_write_cpxlp for reading and
writing problem data in CPLEX LP format were re-implemented to
allow long symbolic names (up to 255 characters).
The following three modules were temporarily removed from the
GLPK distribution due to licensing problems: DELI (an interface
module to Delphi), GLPKMEX (an interface module to Matlab), and
JNI (an interface module to Java).
with some changes and finishing of the package by me.
GLPK is a set of routines written in ANSI C and organized in the form
of a callable library. This package is intended for solving large-scale
linear programming (LP), mixed integer linear programming (MIP), and
other related problems.
GLPK includes the following main components:
* implementation of the primal/dual simplex method;
* implementation of the primal-dual interior point method;
* implementation of the branch-and-bound procedure (based on the dual
simplex method);
* application program interface (API);
* GLPK/L, a modeling language intended for writing LP/MIP models;
* GLPSOL, a stand-alone program intended for solving LP/MIP problems
either prepared in the MPS format or written in the GLPK/L modeling
language.
