http://support.gams.com/ 2012-01-27T10:57:43-05:00 http://support.gams.com/ http://support.gams.com/lib/images/favicon.ico text/html 2012-01-26T10:15:59-05:00 support http://support.gams.com/doku.php?id=gdxrrw:interfacing_gams_and_r&rev=1327590959&do=diff Welcome to the GDXRRW home page! GDXRRW is an interface between GAMS and R. It includes functions to transfer data between GDX and R and a function to call gams from within R. From this site you can download versions of the GDXRRW package for all supported architectures. I also expect to collect some of the common questions and issues about GDXRRW and put them into a FAQ available here. text/html 2012-01-23T07:35:59-05:00 support http://support.gams.com/doku.php?id=solver:commercial_version_of_ipopt&rev=1327322159&do=diff * Starting with 23.8 GAMS offers a commercially supported version of GAMS/IPOPT. This version of GAMS/IPOPT offers in addition the commercial strength linear solvers MA27, MA57, and MA86 from the Harwell Subroutine Library (HSL). * We will continue to include IPOPT without the HSL routines free of charge in the Base module. text/html 2012-01-23T07:30:46-05:00 support http://support.gams.com/doku.php?id=solver:solver&rev=1327321846&do=diff General * How can I hook my own solver to GAMS? * Solver ignores the iterlim/reslim settings in my model * How do I automatically re-submit a model, which failed due to a solver license error? * How much Memory (RAM) does my GAMS Run require? * Model is unbounded / Model has an unbounded ray / Model Status 3 unbounded * Changing the default Solver * Intercepting a Solver Call * The Solver Option File * How do I interrupt a solver? * Solver option file not found (wrong file e… text/html 2012-01-20T09:52:52-05:00 support http://support.gams.com/doku.php?id=gams:gams_emp&rev=1327071172&do=diff EMP couples existing model structures and types with user-provided annotations specifying new or extended structures and relationships. The EMP solver expresses the extended model in standard symbolic form and builds on existing mature solution technology. It is part of the current GAMS distribution and supports many problem classes, including: text/html 2012-01-20T09:45:40-05:00 support http://support.gams.com/doku.php?id=gams:gams&rev=1327070740&do=diff Beta Release Notes How do I... * export only rounded numbers from GAMS to Excel? * enter a macro over multiple lines? * use the matching operator? * compute the median of a parameter's values? * loop over file names? * formulate a power set? * implement a 'lookup-table'? * model that constraint: The sum of consecutive four elements in a vector should be less than 10? * get a list of the available solvers in GAMS? * formulate logical expressions in equations? * get the … text/html 2012-01-10T08:58:00-05:00 support http://support.gams.com/doku.php?id=gams:formulate_a_power_set&rev=1326203880&do=diff Q: Is it possible to create a set that has an index? In my problem, I need to create a constraint for every possible subset of nodes. I have found some code that allows me to create all the subsets (copied below) . What I would like to do is assign each subset to an index (i.e. W(1) = “subset 1”, W(2)=“setset 2”, etc.). Then after all the subsets are found (and assigned to an index of W), I could create the constraint using each W. text/html 2011-12-08T15:10:01-05:00 support http://support.gams.com/doku.php?id=matlab_and_gams:interfacing_optimization_and_visualization_software_via_the_gdxmrw_utilities&rev=1323375001&do=diff Note: The gdxmrw utilities have been developed by Steven P. Dirkse (GAMS Development) and Michael C. Ferris (University of Wisconsin Madiscon New Address All the GAMS/Matlab utilities (rgdx, wgdx, and gams) previously documented and made available here are fully integrated into the GAMS distribution, so no separate downloads are necessary. We recommend that you use the supported version of these utilities integrated into and documented in the GAMS distributions available for download.