I think infeasibility comes from the constraints below:

Code: Select all

```
r5.up = 2.40;
r5.lo =0;
```

I do not know exactly but r5 make the objective function badly constrained.

- 1 year ago
- Forum: Modeling
- Topic: Newbie with GAMS
- Replies:
**3** - Views:
**935**

Hi again,

I think infeasibility comes from the constraints below:
if you comment these two constraints there is no infeasibility.

I do not know exactly but r5 make the objective function badly constrained.

I think infeasibility comes from the constraints below:

Code: Select all

```
r5.up = 2.40;
r5.lo =0;
```

I do not know exactly but r5 make the objective function badly constrained.

- 1 year ago
- Forum: Modeling
- Topic: How to ranging variables
- Replies:
**5** - Views:
**1307**

Hi again. Now I know what is your problem. I'm afraid you can not use ".lo" or ".up" for doing this but I think there is an alternative solution: foe example suppose you have an equation on X in your problem. X + Y * Z >= 6 ; firstly you define : positive variable X , Y , Z; Equations eq1 ; eq1$(X =...

- 1 year ago
- Forum: Modeling
- Topic: Newbie with GAMS
- Replies:
**3** - Views:
**935**

Hi

I'm afraid that some of your equations have been entered wrongly!

for example look at constraint 40!

Am I right?

I'm afraid that some of your equations have been entered wrongly!

for example look at constraint 40!

Am I right?

- 1 year ago
- Forum: Modeling
- Topic: How to ranging variables
- Replies:
**5** - Views:
**1307**

Hi

I'm afraid you did not explain your problem well.

would you mind making it more clear?

I'm afraid you did not explain your problem well.

would you mind making it more clear?

- 1 year ago
- Forum: Modeling
- Topic: GAMS modeling of an conditional equation
- Replies:
**2** - Views:
**1070**

Thanks a million. Hi, You have two strict inequalities there: one comparing parameters, the other comparing variables. The parameters can be compared this way, but not the variables. So you could do something like: set i / blah /; alias (i,j); parameter a(i); variables x(i); equation f(i,j); f(i,j)$...

- 1 year ago
- Forum: Modeling
- Topic: GAMS modeling of an conditional equation
- Replies:
**2** - Views:
**1070**

Hi everyone.

I want to model the equation below in GAMS:
it means **if x(i) > x(j), then y(i) should be greater than y(j).**

here y(i) is a variable and x(i) is a parameter.

I would be appreciated if someone can help how to model it in GAMS.

I want to model the equation below in GAMS:

Code: Select all

```
equation1..
if( x(i) > x(j),
y(i) > y(j);
);
```

here y(i) is a variable and x(i) is a parameter.

I would be appreciated if someone can help how to model it in GAMS.