Search found 21 matches
- 3 years ago
- Forum: Modeling
- Topic: Model has been proven infeasible.
- Replies: 0
- Views: 1974
Model has been proven infeasible.
I am trying to solve a model,however, the “MODEL STATUS” is “4 Infeasible” . I try my best to correct it, however, there is no effect.
If anyone can help me, I will so appreciate it!!
Thank you.
Li
- 3 years ago
- Forum: Modeling
- Topic: How to express the Constraint i≠k
- Replies: 1
- Views: 2079
How to express the Constraint i≠k
Hello all, I am trying to express the constraint: sets i / 1*10 / t / 1*24 /; alias(i,j,k); sets conex /1.2 2.3 3.4 4.5 5.6 6.7 7.8 8.9 9.10/; conex(i,j)$(conex(j,i))=1; eq2(j,t)..P(j,t)=e=sum(i$conex(j,i),Pij(i,j,t))-sum(k$conex(j,k),Pij(j,k,t)); however, I can not add the condition "i≠k"...
- 3 years ago
- Forum: Syntax
- Topic: Problem with loop
- Replies: 2
- Views: 6587
Re: Problem with loop
Thank you for your answer.
The problem is solved by setting converge_ini to 0.
The function of “break” or “continue” is not contained in GAMS 24.4.
Again, thank you.
Li
The problem is solved by setting converge_ini to 0.
The function of “break” or “continue” is not contained in GAMS 24.4.
Again, thank you.
Li
- 3 years ago
- Forum: Syntax
- Topic: Problem with loop
- Replies: 2
- Views: 6587
Problem with loop
Dear All, I am solving a problem with GAMS 24.4/cplex. There are two Loop in my model, and they have to exist in my model. In addition, the function of “break” or “continue” is infeasible. I want to terminate the inner LOOP "t", and start a new outer LOOP "k" when some condition ...
- 4 years ago
- Forum: Modeling
- Topic: Infeasibility row 'eqcut1(2.24)': 0 = -1
- Replies: 0
- Views: 2286
Infeasibility row 'eqcut1(2.24)': 0 = -1
Hello all, I am trying to solve a model using C&CG, and there is a problem about the solution: Infeasibility row 'eqcut1(2.24)': 0 = -1. The solution summary is as follows. MODEL master OBJECTIVE TC TYPE MIP DIRECTION MINIMIZE SOLVER CPLEX FROM LINE 314 **** SOLVER STATUS 1 NORMAL COMPLETION ***...
- 4 years ago
- Forum: Modeling
- Topic: Dual infeasible due to empty column
- Replies: 0
- Views: 2218
Dual infeasible due to empty column
Hello all, I am trying to solve a model using GAMS, and I am getting a problem: Dual infeasible due to empty column 'eta0'. What can I do to solve this problem. The log of solving the problem is as follows, and the code can be attached if needed. Many thanks. LI Reading data... Starting Cplex... Dua...
- 4 years ago
- Forum: Modeling
- Topic: assign parameters in sequence
- Replies: 4
- Views: 5119
Re: assign parameters in sequence
Hi Renger,
It solves my problem perfectly.
Thank you.
Li
It solves my problem perfectly.
Thank you.
Li
- 4 years ago
- Forum: Modeling
- Topic: assign parameters in sequence
- Replies: 4
- Views: 5119
Re: assign parameters in sequence
Thanks for your answer.
However, a vector (P_1(ii)) is needed as there are other variables in my programm.
The purpose of this programm is that I want to eliminate P_1(1) when ii=2.
Could it be done?
However, a vector (P_1(ii)) is needed as there are other variables in my programm.
The purpose of this programm is that I want to eliminate P_1(1) when ii=2.
Could it be done?
- 4 years ago
- Forum: Modeling
- Topic: assign parameters in sequence
- Replies: 4
- Views: 5119
assign parameters in sequence
Hello all, I'm working on assigning a parameter in sequence. In my purpose, the sequence of the parameters is: i=1 P_1= 13 i=2 P_1= 24 i=3 P_1= 15. However. the result in my programm is i=1 P_1= 13 i=2 P_1=1 13 2 24 i=3 P_1=1 13 2 24 3 15. The code is attached. Could someone help me with this proble...
- 4 years ago
- Forum: Archive Google Group
- Topic: unable to understand nature of obtained results
- Replies: 2
- Views: 4764
Re: unable to understand nature of obtained results
Hi Archiver,
I'm facing a similar problem, did you find a solution to this issue ?
Regards
Li
I'm facing a similar problem, did you find a solution to this issue ?
Regards
Li