gams/cplex option file

[esra]

Hi,
I want to create an option file in cplex solver.How can I that?

[Destin Zed]

*To let GAMS know there is a user-defined option file - BEFORE THE *SOLVE STATEMENT
YourModelName.optfile=1;

*Your options ------ example
$onecho > cplex.opt
threads 4
nodefileind 2
workmem 2048
nodesel 2
varsel 3
$offecho

HTH.

Destin

On Mon, Jun 4, 2012 at 9:29 AM, esra <esra...@gmail.com> wrote:

Hi,
I want to create an option file in cplex solver.How can I that?

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[esra]

Hi Destin,
My gams file

model pipe /all/;
Options optcr=1e-4,reslim = 20000,iterlim = 1e9;
Option mip=cplex;
pipe.optfile=1;
SOLVE pipe minimizing PA using mip;
Display PA.l;
File output /pipe_cplex.txt/;

After I run gams, give below error

User supplied options:
startalg 1
mipsearch 1
>> No such option.
*solvefinal 0
fixoptfile fix.opt
>> No such option.

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[Destin Zed]

Esra,

Your piece of GAMS code doesn't show where/how you introduced the CPLEX options. Anyway, the following should work for you.

model pipe /all/;
Options optcr=1e-4,reslim = 20000,iterlim = 1e9;
Option mip=cplex;
pipe.optfile=1;
SOLVE pipe minimizing PA using mip;

$onecho > cplex.opt
startalg 1
mipsearch 1
$offecho

Display PA.l;
File output /pipe_cplex.txt/;

HTH.
Destin.

[esra]

Hi Destin
Thanks your answer I am new user so I don't know how/where I
introduced the cplex opt.file
Programme give below error

Unable to open options file: C:\GAMS\GAMSPDF\CPLEX.OPT.
Unable to process options file.
Presolve found the problem infeasible or unbounded.

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