cutstrategy with xpress in Gams

GAMS
1

Hello everyone.
I have a doubt about syntax, I have a model which I solve using Xpress (OSIxpress) and I want to apply more aggressive cuts. In Xpress I would do it like this: setparam(“xprs_cutstrategy”, 4).
My question is how do I do this using GAMS? I want the solver to remain Xpress but with that feature.
An apology if my doubt in very clumsy but I am just starting to use GAMS.
Regards to all


Hola a todos.

Tengo una duda sobre sintaxis, tengo un modelo que resuelvo usando Xpress (OSIxpress) y quiero aplicar cortes más agresivos. En Xpress lo haría así: setparam(“xprs_cutstrategy”, 4).
Mi pregunta es ¿cómo hago esto usando GAMS? Quiero que el solver siga siendo Xpress pero con esa característica.
Una disculpa si mi duda en muy torpe pero apenas estoy empezando a usar GAMS.
Saludos a todos

2

Hello,

To pass solver-specific options (like the XPRESS cutstrategy parameter) to a solver, use a solver options file.

https://www.gams.com/latest/docs/UG_SolverUsage.html
https://www.gams.com/latest/docs/S_XPRESS.html#XPRESS_OPTIONS

-Steve

3

Thank you Dirkse for taking the time to solve my doubt.

Just one more question, so in order to apply the cutting strategy, the following syntax is correct?

MODEL CSCUC_sinPeridas /all/;
option MIP = OSIxpress;
right > OSIxpress.opt
cutStrategy=3
$offecho
CSCUC_sinPeridas.optfile=1;
CSCUC_sinPeridas.optcr = 0.1 ;
CSCUC_sinPeridas.optca = 0.1 ;
solve CSCUC_sinPeridas minimizing F USING MIP;