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Hi When I run your model, I get the following errors: **** $65,56,65,56,65,56,256 **** 56 Endogenous operands for * not allowed in linear models **** 65 Discrete variables can only appear in MIP, RMIP, MINLP **** RMINLP MIQCP or RMIQCP MPEC RMPEC problems. **** 256 Error(s) in analyzing solve statem...

Hi I ran your model on my notebook (Gams 24.9.1 with CPLEX) and it runs fine. Here is the essential output: EXECUTION TIME = 0.172 SECONDS 4 MB 24.9.1 r63795 WEX-WEI GAMS 24.9.1 r63795 Released Aug 30, 2017 WEX-WEI x86 64bit/MS Windows 07/14/18 16:37:20 Page 5 G e n e r a l A l g e b r a i c M o d e...

Hi
Perhaps this might help you (same issue when using dicopt: viewtopic.php?f=13&t=6802&p=15100&hilit ... ous#p15100.
Cheers
Renger

This is just information by the solver and not an error. Check the manual for more information on the reduced gradient information.
CHeers
Renger

Hi
As in most modeling and programming languages there is a way to write the square root. In Gams there is an explicit function SQRT(x) or you can use x**0.5.

Cheers
Renger

Hi
Use an alias and define the parameter like this

alias(i,j);
mult(i,j) = a(i) * a(j);

cheers
Renger

Hi
You have a two-dimensional variable with 1 dimension in the row and 1 dimension in the column, so you should inform gdxxrw accordingly with rdim=1 cdim=1 instead of 1 0.
Cheers
Renger

Hi
As written in the Rules to this forum

...send the self-contained, executable GAMS code that reproduces your problem to the group.
...describe your problem as clearly as possible.

You might try to reformulate your question, so people will be able to answer it.

CHeers
Renger

Hi
Just do an internet search for Relaxed Mixed Integer Programming.
Cheers
Renger

Hi
Please read the Forum Rules and give more information (code, etc.) so people can help you.
Cheers
Renger