Search found 1044 matches
- 10 months ago
- Forum: Announcements
- Topic: GAMS Distribution 44.0.0 (Beta Release)
- Replies: 0
- Views: 32345
GAMS Distribution 44.0.0 (Beta Release)
Hi GAMS Users, We would like to announce the availability of the GAMS Beta Release 44.0.0. Please consult the beta release notes for details about new features and updated solvers: https://www.gams.com/beta/docs/RN_44.html If you are interested in experimenting with this beta release, please downloa...
- 10 months ago
- Forum: Syntax
- Topic: Table Error 225
- Replies: 1
- Views: 4962
Re: Table Error 225
I guess some mix with TAB and spaces to get the table aligned. I would remove TABs whereever possible and go with spaces only. If that's not the case you should upload (not copy paste because too much can change) the model file so one can reproduce.
-Michael
-Michael
- 10 months ago
- Forum: Syntax
- Topic: dimension error
- Replies: 5
- Views: 6233
Re: dimension error
GAMS has domain checking for a good reason. If you circumvent this by declaring your equations without a domain, then the system can't help you with your own mistakes. Your equation res_dem is defined over (s,t) but you access this (to assign to price) as res_dem.M(t,s). If you would have declared w...
- 10 months ago
- Forum: Solvers
- Topic: Saving Time of when best solution was found & log and lst files with unique names
- Replies: 3
- Views: 6259
Re: Saving Time of when best solution was found & log and lst files with unique names
I don't think there is a general "time saving" option in BARON. Even though your best incumbent is found quickly BARON still needs to move the dual bound to reach the optimality tolerance. That can sometimes take a long time, even if you already know and hold the optimal solution. If you c...
- 10 months ago
- Forum: Solvers
- Topic: BARON numLoc & local search preprocessing
- Replies: 2
- Views: 5771
Re: BARON numLoc & local search preprocessing
In GAMS, solver option are passed via a solver option file. You can create this inside a GAMS model via $on/offEcho > baron.opt (at compile time) or via put files at execution time. The use of solver option files is explained here: https://www.gams.com/latest/docs/UG_SolverUsage.html#BASIC_USAGE_SOL...
- 10 months ago
- Forum: Solvers
- Topic: BARON: terminates solver when solution does not improve after x amount of time
- Replies: 1
- Views: 5508
Re: BARON: terminates solver when solution does not improve after x amount of time
Not with BARON. Some solvers allow you "user defined" termination via callbacks and this is made available to GAMS users, see e.g. https://www.gams.com/latest/docs/S_CPLE ... ipstopexpr.
-Michael
-Michael
- 10 months ago
- Forum: Modeling
- Topic: Problem infeasible or unbounded
- Replies: 1
- Views: 2781
Re: Problem infeasible or unbounded
Nothing. You should use code boxes for your model and output though. You model in unbounded. Just limit the objective variable (e.g. z.lo = -1e6;) and see what "run away" variables you get. Check your application why this should not happen, turn your insight into constraints/model logic. -...
- 10 months ago
- Forum: Syntax
- Topic: dimension error
- Replies: 5
- Views: 6233
Re: dimension error
The attached program succeeds without a problem. If I remove the $stop and let GAMS continue, I get compilation errors when compiling "startup(s*,i,t)", you probably means "startup(s,t,*,i)" at least that makes sense from the code you have later. Now after fixing all this, I get ...
- 10 months ago
- Forum: Syntax
- Topic: dimension error
- Replies: 5
- Views: 6233
Re: dimension error
Don't just paste your GAMS source as normal text. There are fine code boxes in the forum editor. Also this issue is related to data so upload your Excel and GDX file as well so one can reproduce the error.
-Michael
-Michael
- 10 months ago
- Forum: API
- Topic: Trouble installing Python GAMS API on Mac OS
- Replies: 5
- Views: 5642
Re: Trouble installing Python GAMS API on Mac OS
Yes. -Michael