GAMS World Forum

Hi, I cannot reproduce your findings. The equation listing shows ---- OBJECTIVE =E= OBJECTIVE.. PRODCOST - PRODCOST_BY_INTERVAL(7) - PRODCOST_BY_INTERVAL(1) - [...] - PRODCOST_BY_INTERVAL(167) - PRODCOST_BY_INTERVAL(168) =E= 0 ; (LHS = 0) Are you sure that the lst excerpt Trial2_lst.txt from your in...

Hi Eric,

You might want to read about multi-dimensional sets (https://www.gams.com/latest/docs/UG_Set ... sionalSets) to figure out how to implement a mapping between your sets t and s.

I hope this helps!

Fred

Hi,

Did you look at the lst file? It usually provides meaningful error messages (search for ****).
It might help, if you share your code, so other forum users can reproduce the issue.

Best,
Fred

Hi,

Could you share the GDX files such that one could actually run the gms file to reproduce this?

Best,
Fred

Hi, You are not using proper GAMS syntax. You miss the indices and also it seems that you do not need $ondelim. The following code snippet illustrates how your data should be formatted (with or withour $ondelim) parameter x(i)/ 1 2, 2 2.003, 3 2.006, 4 2.009 /; parameter xx(i)/ $ondelim 1,2 2,2.003 ...

Hi, Basically your approaches all try to state that if pen<0 then pen=0 . That doesn't work.This has not so much to do with GAMS but is rather a general question on how to model logical conditions (see for example this thread: https://forum.gamsworld.org/viewtopic.php?f=2&t=10931&p=25589&...

Hi, with recent versions you should get a message like this from Mosek: The constraint 'eq8'(3) is not convex. Q should be negative semidefinite for a constraint with finite lower bound. (*1294*) Setting non-negative lower bounds on x1 and s1 resolves the problem. free variable x1, x2, x3; x1.lo = 0...

Hi Alireza, You could install GAMS 29 beta which has been released earlier this week and should just work with Catalina: https://www.gams.com/29/ For older versions, please install the Mac version of GAMS and follow one of the workarounds described in the previous posts of this thread. I hope this h...

Hi, With a GDX data layer, you have lots of flexibility when it comes to loading the data into GAMS. Besides the filtered read you get with $load, you can for example turn on domain checking when items are loaded with $loadDC or merge data into an already defined symbol with $loadM, etc. For more de...

Hi, I ran the following and it works: $onecho > shockC.csv ,sp1,sp2 2019,51.59000962,221.2765056 2020,297.1442391,198.4488019 2021,30.89360312,106.7259835 $offecho SETS yr year /2019*2039/ scn scenario /sp1,sp2/ Table shockC(yr,scn) 'shock path' $ondelim $include shockC.csv $offdelim ; display shock...