http://interfaces.gams-software.com/ 2009-07-30T11:24:25-04:00 http://interfaces.gams-software.com/ http://interfaces.gams-software.com/lib/images/favicon.ico text/html 2009-07-28T13:43:37-04:00 interfaces http://interfaces.gams-software.com/doku.php?id=gdx:gdxtools&rev=1248803017&do=diff A GDX (GAMS Data Exchange) file is a file that stores the values of one or more GAMS symbols such as sets, parameters variables and equations. GDX files can be used to prepare data for a GAMS model, present results of a GAMS model, store results of the same model using different parameters etc. A GDX file does not store a model formulation or executable statements. text/html 2009-07-28T13:41:51-04:00 interfaces http://interfaces.gams-software.com/doku.php?id=excel:excel&rev=1248802911&do=diff A tutorial on how to use the GDX facilities in GAMS to read data from Excel and to write data to Excel. This section gives a brief overview on how to use the GDX facilities in GAMS to read data from Excel and to write data to Excel. For more detailed information please consult the document on GDX Facilities and Tools. text/html 2009-06-15T07:37:14-04:00 interfaces http://interfaces.gams-software.com/doku.php?id=user:user_contributed_software_and_tools&rev=1245065834&do=diff Some of our users have developed software that helps them use GAMS more efficiently or enables them to interface GAMS with other systems or software packages they use to do their work. If you would like to contribute some of your software, we can help you to make it publicly accessible - just drop us a line. text/html 2009-03-16T04:47:27-04:00 interfaces http://interfaces.gams-software.com/doku.php?id=ext:external_functions_in_gams&rev=1237193247&do=diff Motivation Nonlinear models solved by (recent versions of) CONOPT, MINOS or SNOPT can contain socalled external functions. External functions are constraints of the form F(y) = 0 that are not specified in GAMS but in a separate subroutine. The subroutine needs to be packaged in a DLL (dynamic link library) for Windows, or shared object for Unix systems. A DLL can be written in most popular languages: C/C++, Delphi, Visual Basic, Fortran etc. text/html 2008-11-03T00:57:34-04:00 interfaces http://interfaces.gams-software.com/doku.php?id=gnuplot&rev=1225691854&do=diff Introduction and Basics Using the Put Writing Facility data and scripts can easily setup for use with Gnuplot. An example is: set k /k1*k500/; set a /a1*a4/; parameter aval(a) /a1 0.5, a2 1, a3 3, a4 10/; scalar xlo /0.0001/; scalar xup /16/; scalar n; n = card(k); scalar step; step = (xup-xlo)/n; parameter xpoint(k); xpoint(k) = xlo + step*(ord(k)-1); parameter ypoint(k,a); ypoint(k,a) = incgamma(xpoint(k),aval(a)); display xpoint,ypoint; file datafile /incgamma.dat/; put datafi… text/html 2008-10-30T11:58:41-04:00 interfaces http://interfaces.gams-software.com/doku.php?id=the_gams_grid_computing_facility&rev=1225382321&do=diff Note: This is copy of appendix J of the GAMS User's Guide. Introduction As systems with multiple CPUs and High Performance Computing Grids are becoming available more widely, the GAMS language has been extended to take advantage of these new environments. New language features facilitate the management of asynchronous submission and collection of model solution tasks in a platform independent fashion. A simple architecture relying on existing operating system functionality allows for rapid in…