## Search found 17 matches

- 6 months ago
- Forum: Modeling
- Topic: Infeasibility row 'eqcut1(2.24)': 0 = -1
- Replies:
**0** - Views:
**792**

### 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 **** MO...

- 6 months ago
- Forum: Modeling
- Topic: Dual infeasible due to empty column
- Replies:
**0** - Views:
**752**

### 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...

- 8 months ago
- Forum: Modeling
- Topic: assign parameters in sequence
- Replies:
**4** - Views:
**511**

### Re: assign parameters in sequence

Hi Renger,

It solves my problem perfectly.

Thank you.

Li

It solves my problem perfectly.

Thank you.

Li

- 8 months ago
- Forum: Modeling
- Topic: assign parameters in sequence
- Replies:
**4** - Views:
**511**

### 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?

- 8 months ago
- Forum: Modeling
- Topic: assign parameters in sequence
- Replies:
**4** - Views:
**511**

### 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...

- 10 months ago
- Forum: Archive Google Group
- Topic: unable to understand nature of obtained results
- Replies:
**2** - Views:
**939**

### 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

- 11 months ago
- Forum: Modeling
- Topic: Need help to programm j≠i
- Replies:
**2** - Views:
**510**

### Re: Need help to programm j≠i

Hi Fred,

Thank you for your prompt reply. It solves my problem perfectly.

Just as you said, I misinterpret the GAMS syntax 'j ≠i ' as 'j<>i '.

Again, thank you!

Best,

Li

Thank you for your prompt reply. It solves my problem perfectly.

Just as you said, I misinterpret the GAMS syntax 'j ≠i ' as 'j<>i '.

Again, thank you!

Best,

Li

- 11 months ago
- Forum: Modeling
- Topic: Need help to programm j≠i
- Replies:
**2** - Views:
**510**

### Need help to programm j≠i

Hello all, I want to programm a formulation: sum(t, sum(j∈N & j≠i, P(i,j,t))). The code is as follows: set i / 1,2,3 / t / 1*24 /; alias(i,j); sum((t,j)$(t,j<>i), p(i,j,t)) However, the programm repor some errors: 148 Dimension different - The symbol is referenced with more/less indices as declared ...

- 11 months ago
- Forum: Solvers
- Topic: Can someone help me with GAMS Error 148
- Replies:
**4** - Views:
**946**

- 11 months ago
- Forum: Solvers
- Topic: Can someone help me with GAMS Error 148
- Replies:
**4** - Views:
**946**

### Re: Can someone help me with GAMS Error 148

Hi Renger, Thanks for your answer. In my purpose, I exactly want to minimize each ETA (ETA(1), ETA(2), ETA(3)) because I want to utilize some distributed algorithm. And p_pvf(i,t) is a variable in my future formulation. Could you give me some advice to write it under the rule "write one objective fu...