GAMS World Forum

Hey there :) I'd like to use the opportunity to showcase a piece we have done regarding interactive "data-story" notebooks using GAMS. An Introduction to operations research in Observables https://user-images.githubusercontent.com/20703207/87766667-d1ee1480-c819-11ea-9d1c-c8db46ffb17a.png The Observ...

Thanks a lot for your help! The workaround is sufficient for me (for the time being)

Best
Christoph

Hi there, I'm running a model with the command line parameter `dumpOpt=11` in order to generate a single GAMS file containing all includes and data. However, using $GDXIN with 0 level elements seems to create a compilation error in the .dmp file: Simplified (reproducible) problem (which compiles fin...

Thanks Steve and Renger for your replies, So again a short note about our current procedure: We don't do the tests manually anymore, as we wrote an R-script that automates the process: 1) On every SVN update, a post-commit hook on the SVN server runs the R-script, which in turn runs the GAMS batch f...

Here at our institute, we work on a couple of (larger scale) economics related GAMS models. Different teams, involved in different projects make adaptations to the models in order to answer their specific research questions. The models are equipped with a Graphical User Interface (GUI), and are vers...

Thanks @ameeraus for the reply and the elegant solution to my problem. As you might have guessed, I totally oversaw that my .fx was actually resetting the lower bound of the variable. If I would have actually set a lower bound of 1 (instead of fixing it), I would have received a matrix error stating...

Hi everyone, In a MIP model with option optCR=0; , I face the problem that CPLEX does not return the "true" optimal solution to the problem. When I manually fix some binaries, I can increase the objective value (without breaking any constraints) by more than 1%. I'm sure that this is caused by a mis...

Hi,
Thanks a lot for that great hint Fred!
I just tried and it seems to work really nice

Best,
Christoph

Dear all, I would like to know if there is a way to generate the equation and column listing of a model without actually solving it (basically dry running the model). The background is that solving the model takes quiet some time, and for debugging I sometimes just want to check if e.g. the dollar c...

Hi, I worked on a GAMS IDE plugin for the popular Atom editor for the past half-year and thought that it might be of interest for some of you. The plugin is called linter-gams . Atom is an open-source editor maintained by Github, that features a beautiful user-interface, high customizability and a l...