GAMS World Forum

Hi Stan You can build subsets like this set year ' 'Full set of years' /M1*M120/; year1(year) 'First half of all years' /M1*M12/, year2(year) 'Second half of all years' /M25*M36/; loop(year1, .... ); or loop over all years but constrain the loop to the first half loop(year$year1(year), .. ); If you ...

Hi You have made the following errors: solve IMPREX USING DNLP maximize Old_demand(j,y,a); You are maximizing several variables at the same time (and if this would be possible, you should have written it like solve IMPREX USING DNLP maximize Old_demand; The maximand should be one-dimensional if you ...

Hi Since Version 24.8.1 the summary now also gives as information: "Projected". The release notes tell me "the number of variables and equations where the level was projected to one of the bounds (compare model attribute tolProj), if that number is greater than 0 ." Could any exp...

Hi Ceepbit You shouldn't use the dot-notation. Every set element should be in its own cell in excel. In your case: BT AGR AGRI INDU 1 The gdxxrw command will then be: $CALL GDXXRW.exe x2017b.xlsx par=SAM rng=A1:E6 rdim=2 cdim=2 Two sets are found in the rows (rdim=2), two sets are found in the colum...

Hi

sameas(a,b) expects both a and b in the equation, so they can be compared (e.g. eq1(a,b)$(not sameas(a,b)).

Example:

Code: Select all

set A/a1*a10/;
set B(A)/a2*a4/;
set C(A);
C(A)= not B(A);

parameter t(a,b);

t(a,b)$(not sameas(a,b)) = 1;

display t;

Renger

Code: Select all

sum((i,t), c(i,t)X(i,t);

Hi Mosalari

A quick search at gams.com https://www.gams.com/search/?q=invert points to topics that answer your question (so read the guidelines under "Rules" before you post

)

Renger

Hi
If you want a specific set element, you can also use the ord and card functions:

Code: Select all

set 
A/a1,a2/;
parameter h(a);

* first element
h("a1")
h(a)$(ord(a) = 1)

* second element
h("a2") 
h(a)$(ord(a) = 2)

* last element
h(a)$(ord(a) eq card(a))

Cheers
Renger

Hi Tiago
Unfortunately, the new forum was not yet ready to allow attachments. Please add your attachment once again.
Sorry
Renger

GAMS World Forum

Search found 639 matches

Re: Read part of a table

Re: Cannot solve error 148

Projected

Re: Error while reading four-dimensional data form excel

Re: equaiton based on part of a set

Re: Guidance towards time series formulation in GAMS

Re: how to invert a variable

Re: how to get any element from a set

Re: Problem with the Model status with Antigone solver