GAMS World Forum

Hi You could search in this forum for Error 149 as strongly advised in the "Forum rules" ... 115 parameter a(i,j); 116 a(i,j)= normal(x(j,i),t(j,p)); or study the error message "149 Uncontrolled set entered as constant". You define a parameter over the sets i and j, but on the ri...

Hi You can loop over the whole horizon and change the parameters for the shocks. Here some example code: set t Periods /1*20/; set sc /BAU, SHOCK/; parameter parshock(sc,t) Shock some parameters parshock(sc,t) = 0; parshock("SHOCK",t)$(t.val < 5) = 2; parshock("SHOCK",t)$(t.val >...

looks fine.
R

Hi
Perhaps your problem has multiple solutions? You could use the solution of the first method as starting point for the second and see if the second algorithm and see if this reproduces this first solution. (the same vice versa).
Cheers
Renger

Hi
You could just split the constraint in: Cheers
Renger

Hi
You made your model non-linear as the variables C and X are multiplied with each other.
If you change your solve instruction into it solves nicely.
Cheers
Renger

Hi I might be missing the point, but why don't you use the profit equation as described in your question? equation profit(j) Profit equation; c(j)=E= a('T1',j) - a('N1',j) - a('N2',j) If you paste code, please use the button "</>" in the editor. It will keep the formatting. Furthermore, wi...

Hi THe only thing I can think of is starting the outer loop before the assignments of the default values. In your simple example: *set up all default data parameter x; loop(i, x = 0; loop(j, *manipulate parameters x=x+j Objective=E=f(i,j) solve model min Objective ) ) Cheers Renger

Hi Sue
Could you write out examples of the equation you want in point 1. It is not clear to me.
Point 2: You could use a set defining which elements you don't want (e.g. set src(nt) /n3/; and write the equation q4(nt)$(not src(nt)).

Cheers
Renger

Hi The problem is that you use both i and j in two different ways: as an index for the equation and as summation index. You need an alias: alias(i,ai), (j,aj); eq6(i,j).. sum(ai, Q(ai,j)) =e= sum(aj, Q(i,aj)); This resolves the confusion on what to do with "i" and "j". Cheers Ren...