GAMS World Forum

This post contains some information on how to give a proper reference to the GAMS software and the GAMS documentation in a (scientific) paper. Since the software and the documentation changes with every release, it is a good idea to include the release number XX.Y.Z. A particular release has a publi...

Looking at your .gms file I see that you declared IOT30 over the domains (RIOT, CIOT ). PS1 is an alias to PS which is a subset of RIOT not CIOT, therefore the domain violation occurs for xx(PS,PS1) = IOT30(PS, PS1 ); and VI(FI,PS1) = IOT30(FI, PS1 ); (PS1 is the wrong domain here given how you decl...

Please have a look at the code below. The second model requires a decent GAMS/CPLEX license: set i / 1*4 / s / 1*5 / table data(s,*) 1 2 3 4 val 1 0 1 1 0 23 2 1 0 0 1 -5 3 1 0 1 0 16 4 0 1 0 1 4 5 1 1 1 0 111 ; parameter c(i) "cost of i when on"; c(i) = -uniformInt(1,10); display c; varia...

In my case the determinant is the summation of the variables from U1 to Ux that have been introduced as a binary variable to GAMS. In each iteration during the optimization these variables are set to 0 or 1 but the structure of these variables should be considered in the optimization process, for ex...

Hi paganini, Can you say more specifically where you got confused reading the documenation of SCENRED2 and what it is you are confused about? You might want to check out the simplified interface to SCENRED2 . You need to specify n the set of nodes in the tree, tree the set of ancestor relations desc...

I assume that you've checked the model and solver status values in the Solve Summary to be sure that the model is stopping with "Normal Completion" and "Locally Optimal". If not, you are just looking at the point where the solver gave up looking for a solution. Unless your model ...

I am using a non-linear solver and I am finding I get different results depending on the order of my data. Can you suggest any reason why this would be?

Some GAMS Programming Utilities for Economists including: A little GAMS Program that illustrates Report Generation with Excel.pdf Copy Table to Word - Copy non-blank cells from Excel into Word as a Windows metafile graphical image (retaining Excel formatting). qtool - Tools for Systematic Sensitivit...

Overview GAMSMAP is a collection of GAMS routines and data files to create specific MapInfo© maps. The tools grew out of a project we did with one of our clients in which we sought to speed up by replacing hand drawn maps by automatically created maps. Because of the proprietary nature of the work,...

GAMS-MATLAB - Helper functions for coupling GAMS optimisation models with MATLAB for data I/O.