GAMS — The Solver Manuals - Available Software

76 COIN-OR
userheurmult (integer)
Determines the multiplier for the frequency of the heuristic model calls.
(default = 2)
userheurnewint (integer)
Calls the heuristic if the solver found a new integer feasible solution.
(default = 1)
0 . Do not call heuristic because a new integer feasible solution is found.
1 . Let CBC call the heuristic if a new integer feasible solution is found.
userheurobjfirst (integer)
Similar to userheurfirst but only calls the heuristic if the relaxed objective value promises a significant
improvement of the current incumbent, i.e., the LP value of the node has to be closer to the best bound
than the current incumbent.
(default = 0)
userjobid (string)
Postfixes to use for gdxname, gdxnameinc, and gdxin.
userkeep (integer)
Calls gamskeep instead of gams
(default = 0)
4 CoinGlpk
GAMS/CoinGlpk brings the open source LP/MIP solver Glpk from the GNU Open Software foundation to the
broad audience of GAMS users.
The code has been written primarily by A. Makhorin. The interface uses the OSI Glpk interface written by
Vivian De Smedt, Braden Hunsaker, and Lou Hafer.
For more information we refer to
• the Glpk web site http://www.gnu.org/software/glpk/glpk.html and
• the Osi web site https://projects.coin-or.org/Osi.
Most of the Glpk documentation in the section was taken from the Glpk manual.
4.1 Model requirements
Glpk supports continuous, binary, and integer variables, but no special ordered sets, semi-continuous or semiinteger
variables (see chapter 17.1 of the GAMS User’s Guide). Also branching priorities are not supported.
4.2 Usage of CoinGlpk
The following statement can be used inside your GAMS program to specify using CoinGlpk
Option LP = CoinGlpk; { or MIP or RMIP }