GAMS World Forum

Hi You could make it an optimization problem by adding following: variable OBJ objective equation dummy Dummy objective; dummy.. OBJ =E= 1; Then solve the model maximizing OBJ. GAMS will find OBJ being equal to 1 solves the problem while at the same time solving the other equations. I hope this help...

Hi Judith If GAMS tells you that there is a division by zero, you can bet on it that there is one, so you should display the divisor. One problem is that zero values are not shown in the output. You can check this by adding EPS to the parameter (after checking I should remove it). RO(k,j) = RO(k,j) ...

Hi Sorry, my mistake. Here a solution: you split the equation in three parts and use the conditions on those parts p(s,h).. A(s,h) =E= 12$(ord(h) = 1 )$(ord(h) eq 1) + 10$(ord(h) > 1 and ord(h) < card(h)); 8$(ord(h) = card(h); THis will result in A(s,h) begin 12 in the first hour, 10 in the in-betwe...

Hi
Yould define a parameter as follows:

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alias(h,ah);

parameter hnr(h)  Hour ord;

hnr(h) = ord(h);

p(s,h,ah)$(ord(h) eq hnr(h))..

Cheers
Renger

Hi
You can use a condition to sum:

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sum(t$(t.val < h.val+1), ...)

Cheers
Renger

Hi Your question is a little bit too general, but I would say that this is just solving your model, and if the second part has the same variables, no initialization is needed and just solve the second one after the first solve. If the second part has other variables that should use the solution of t...

Hi Hakeem
I am not sure if this is what you are looking for

HGDPwFSPangy.gms: (9.64 KiB) Downloaded 402 times

Cheers
Renger

Hi
Although I am not fluent in Matlab, I noticed that your values are a 26x2 matrix, but the dimension of your sets is different 26 and not 2.
I hope this helps
Cheers
Renger

Hi

I think you could do without t in H(i,t). Then, if in year x, H(i) becomes 1, you fix it to that level and it will stay like this in all t afterwards.

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if(h(i) = 1; h.FX(i)  = 1;);

Cheers
Renger

Same procedure:
replace the parameter or variable with one without the index t, remove the sum and, if it is a parameter, initialize it in the loop with the value for period t
Cheers
Renger

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