Search found 345 matches

by bussieck
1 week ago
Forum: Announcements
Topic: GAMS Distribution 29.0.0 (Beta Release)
Replies: 0
Views: 31

GAMS Distribution 29.0.0 (Beta Release)

Hi GAMS Users, We want to announce the availability of the GAMS Beta Release 29.0.0! Please consult the beta release notes for details about new features and updated solvers https://www.gams.com/beta/docs/RN_29.html . If you are interested in experimenting with this beta release, please download the...
by bussieck
1 month ago
Forum: Solvers
Topic: binary variable is not binary!
Replies: 1
Views: 119

Re: binary variable is not binary!

Ever heard of tolerances? A solver is full of these. The "integer" tolerance is often 1e-6 (see e.g. https://www.gams.com/latest/docs/S_CPLEX.html#CPLEXepint). Depending on your solver you might be able to make this smaller or in some cases even set it to 0 (e.g. Cplex). There is some lively discuss...
by bussieck
1 month ago
Forum: Modeling
Topic: change variable type
Replies: 1
Views: 75

Re: change variable type

In general no, but you can set .prior suffix to inf to make a discrete variable continuous, see https://www.gams.com/latest/docs/UG_Var ... __2f_prior.

-Michael
by bussieck
1 month ago
Forum: Tools
Topic: GAMS Ubuntu
Replies: 1
Views: 490

Re: GAMS Ubuntu

That won't work. Wine implements the Windows API not the overall Windows system, so not OLE or ODBC data connectors that are used by sql2gms.
-Michael
by bussieck
1 month ago
Forum: Wishes
Topic: Support SQL2gms for Unix version
Replies: 1
Views: 799

Re: Support SQL2gms for Unix version

sql2gms relies on Windows functionality (odbc data connectors) so there is little chance to port this to other platforms. We have a couple of clients who successfully use e.g. SQLAlchemy and GAMS embedded Python code to communicate with SQL databases (on Unix). Here is a simple example. I have attac...
by bussieck
2 months ago
Forum: Announcements
Topic: GAMS Distribution 28.2.0 (Minor Release)
Replies: 1
Views: 461

Re: GAMS Distribution 28.2.0 (Minor Release)

Hi GAMS Users, An additional note about this release: Among others, this release is required to fix an issue in the previous 28 release with optimizing the performance of certain terms in the model generation. In some rare cases, incorrect results can occur with no further side effects (e.g. a crash...
by bussieck
2 months ago
Forum: Bugs
Topic: Crash with GAMS v28.1 (x64)
Replies: 2
Views: 1178

Re: Crash with GAMS v28.1 (x64)

This has been fixed in GAMS 28.2.0.

-Michael
by bussieck
2 months ago
Forum: Announcements
Topic: GAMS Distribution 28.2.0 (Minor Release)
Replies: 1
Views: 461

GAMS Distribution 28.2.0 (Minor Release)

Hi GAMS Users,

We started distributing GAMS Minor Release 28.2.0 on August 19, 2019.

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

Here are the release notes: https://www.gams.com/latest/docs/RN_28.html#RN_2820

Your GAMS Team
www.gams.com
by bussieck
2 months ago
Forum: Bugs
Topic: Crash with GAMS v28.1 (x64)
Replies: 2
Views: 1178

Re: Crash with GAMS v28.1 (x64)

This is pretty embarrassing. Thanks for taking the time to make a small and reproducible example. The crash is likely to be related to some speed improvements in the model generation. We will look into this and fix this ASAP.

-Michael
by bussieck
3 months ago
Forum: Announcements
Topic: GAMS Distribution 28.1.0 Announcement
Replies: 0
Views: 439

GAMS Distribution 28.1.0 Announcement

Hi GAMS Users,

We started distributing GAMS Release 28.1.0 on August 2, 2019.

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

Here are the release notes: https://www.gams.com/latest/docs/RN_28.html

Your GAMS Team
www.gams.com