GAMS — The Solver Manuals - Available Software

80 COIN-OR
noiterlim (integer)
Allows to switch off the simplex iteration limit. You can remove the limit on the simplex iterations by
setting the noiterlim option.
(default = 0)
0 Keeps simplex iteration limit.
1 Turns off simplex iteration limit.
names (integer)
This option causes GAMS names for the variables and equations to be loaded into Glpk. These names will
then be used for error messages, log entries, and so forth. Turing names off may help if memory is very
tight.
(default = 0)
0 . Do not load variable and equation names.
1 . Load variable and equation names.
solvefinal (integer)
Sometimes the solution process after the branch-and-cut that solves the problem with fixed discrete variables
takes a long time and the user is interested in the primal values of the solution only. In these cases, this
option can be used to turn this final solve off. Without the final solve no proper marginal values are available
and only zeros are returned to GAMS.
(default = 1)
reslim (real)
0 . Do not solve the fixed problem
1 . Solve the fixed problem and return duals
Maximum time in seconds.
(default = GAMS reslim)
iterlim (integer)
Maximum number of simplex iterations.
(default = GAMS iterlim)
optcr (real)
Relative optimality criterion for a MIP. The search is stoped when the relative gap between the incumbent
and the bound given by the LP relaxation is smaller than this value.
(default = GAMS optcr)
writemps (string)
Write an MPS problem file. The parameter value is the name of the MPS file.
5 CoinIpopt
GAMS/CoinIpopt brings the open source NLP solver Ipopt from the COIN-OR foundation to the broad audience
of GAMS users.
Ipopt (Interior Point Optimizer) is an open-source solver for large-scale nonlinear programming. The code has
been written primarily by Andreas Wächter, who is the COIN-OR project leader for Ipopt.
For more information we refer to
• the Ipopt web site https://projects.coin-or.org/Ipopt and