Search found 372 matches

by bussieck
5 days ago
Forum: Modeling
Topic: Infeasible Stochastic Model
Replies: 4
Views: 134

Re: Infeasible Stochastic Model

As I suspected, the deterministic problem is already infeasible: ... CPXPARAM_Tune_TimeLimit 200 Infeasibility row 'cashbalance(1)': 0 = -11.4128. Presolve time = 0.00 sec. (0.01 ticks) LP status(3): infeasible Cplex Time: 0.00sec (det. 0.01 ticks) ... There are plenty of ways to deal with infeasibl...
by bussieck
6 days ago
Forum: Modeling
Topic: Infeasible Stochastic Model
Replies: 4
Views: 134

Re: Infeasible Stochastic Model

Without the Excel file I could not reproduce your findings. First thing I would do to see if the deterministic model is feasible. So before you do some fancy stochastic stuff, solve the deterministic model as a regular LP and see if this is feasible or not. It's probably much easier debugging this i...
by bussieck
1 week ago
Forum: Tools
Topic: How to replace a parameter entry from one gdx file to another
Replies: 1
Views: 95

Re: How to replace a parameter entry from one gdx file to another

There is no replace mechanism in GDX. You can load all your data from GDX into a GAMS program including your "old" p(i,j,k) now you make a new parameter pnew(i,j,k,l,m) from the values of the old parameters. Now you export all the parameters using execute_unload 'new.gdx', i,j,k,l,...,pnew=p ; The p...
by bussieck
1 week ago
Forum: GAMS MIRO
Topic: GAMS MIRO Release Candidate
Replies: 0
Views: 65

GAMS MIRO Release Candidate

Finally the time has come: We have reached the very last stage before the official release of GAMS MIRO. Today we would like to present to you the release candidate for GAMS MIRO version 1.0. Since the last Beta (version 0.6) we have given MIRO a complete overhaul and improved it in terms of functio...
by bussieck
1 week ago
Forum: Announcements
Topic: GAMS Distribution 30.2.0 (Minor Release)
Replies: 0
Views: 51

GAMS Distribution 30.2.0 (Minor Release)

Hi GAMS Users,

We started distributing GAMS Minor Release 30.2.0 on February 11, 2020.

You can download the software from https://www.gams.com/download/

Here are the release notes: https://www.gams.com/latest/docs/RN_30.html#RN_3020

Your GAMS Team
www.gams.com
by bussieck
1 month ago
Forum: Announcements
Topic: GAMS Distribution 30.1.0 Announcement
Replies: 0
Views: 575

GAMS Distribution 30.1.0 Announcement

Hi GAMS Users,

We started distributing GAMS Release 30.1.0 on January 10. 2020.

You can download the software from https://www.gams.com/download/.

Here are the release notes: https://www.gams.com/latest/docs/RN_30.html

Your GAMS Team
www.gams.com
by bussieck
1 month ago
Forum: Modeling
Topic: Exit code 3
Replies: 1
Views: 241

Re: Exit code 3

Seriously? You post a picture from a log with a stolen license and expect help?

-Michael
by bussieck
1 month ago
Forum: Syntax
Topic: Reading in Large Tables
Replies: 1
Views: 183

Re: Reading in Large Tables

No, This looks more like a syntax problem. If you post something that lets us reproduce the issue or you paste some actual log output together with the commands you issue, that would help us helping you.

-Michael
by bussieck
1 month ago
Forum: Syntax
Topic: Error 2- Identifier Expected
Replies: 13
Views: 745

Re: Error 2- Identifier Expected

If you have a scenario loop you need to move all the declarations and equation definitions before this loop. Also check your understanding of compile and execution time in GAMS. Multiple "$echo deltaterm 1 > baron.opt" have no effect because they are all done before execution starts, so the last "$e...
by bussieck
1 month ago
Forum: Syntax
Topic: Error 149 uncontrolled set entered as constant
Replies: 1
Views: 197

Re: Error 149 uncontrolled set entered as constant

Your equation is controlled by i only. Your right hand side has a symbol (qiBiZhangtai) indexed by i and t. What t?

-Michael