Search found 8 matches

by femibode
1 year ago
Forum: Modeling
Topic: Solving without Min or Max
Replies: 3
Views: 3221

Re: Solving without Min or Max

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 hel...
by femibode
3 years ago
Forum: Modeling
Topic: Reasons for equation not being executed
Replies: 4
Views: 2634

Re: Reasons for equation not being executed

I think there's a difference between equations not being listed in the .lst and not being executed. Can you check any limrow option. Option limrow = ? is used to decided how many of your equations are listed per block. You can also check your solution to ascertain which equations are and not executed.
by femibode
3 years ago
Forum: Modeling
Topic: a scenario run yields different results when run singly and in a loop of others
Replies: 2
Views: 30503

a scenario run yields different results when run singly and in a loop of others

Hi there wondering if somebody can help me understand why a model scenario gives different results when ran singly and when run in a loop with other scenarios. For example, when I run it singly, my set up is as follow: Loop(scenario$(ord(scenario) lt 3 and ord(scenario) eq 2), if(ord(scenario) eq 1,...
by femibode
4 years ago
Forum: Modeling
Topic: Finding average
Replies: 1
Views: 2678

Re: Finding average

I managed with the following but would like to know if there's other means as I need to find median as well
aveX = sum([i,j], X(i,j)) / (card(i)*card(j));
aveY = sum([i,j,k], Y(i,j,k)) / (card(i)*card(j)*card(k));
by femibode
4 years ago
Forum: Modeling
Topic: Finding average
Replies: 1
Views: 2678

Finding average

I would appreciate if anyone can help me. I'm struggling to write equation to compute average of a set that has more than one dimensions. E.g how do I find average of
X(i,j)
Y(i,j,k)

Thanks
by femibode
4 years ago
Forum: Modeling
Topic: Multiple Conditions in one Equation
Replies: 4
Views: 4026

Re: Multiple Conditions in one Equation

then I would try this:

Code: Select all

 Neweq.. AI("1")$(BI("1") = CI("1") and CI("1") = DI("1") ) =E= BI("1") 
by femibode
4 years ago
Forum: Modeling
Topic: Multiple Conditions in one Equation
Replies: 4
Views: 4026

Re: Multiple Conditions in one Equation

1. If GAMS allows using multiple mathematical operators in an equation, yes but if not, no. 2. This is the general syntax for defining equation in GAMS: eqn_name(index_list)[$logical_condition(s)].. expression eqn_type expression; 3. Do you only need to ensure equality of these multiple entities? An...