GAMS World Forum

I can't understand. As you say, the 3rd iteration constraint "2.5 <= x <= 8" will be added iff z result in the 2nd iteration is <= 1, but z reaches its optimum 2 in 2nd iteration. So the constraint will not be triggered. You can observe the Equation list in .lst file to check the constrai...

Hi Anby, First of all, your model is apparently infeasible because you have w <= 22 and w >= 26, which is contradictory. Then the way you add your constraint is weird. But it is still doable in GAMS. I have written the code for you, which shows integer infeasible. Hello Gabriel, Thank you for your ...

So I am trying to implement an algorithm by augmenting with cuts after every iteration. The master problem is, minimize w =-x - 10z s.t. -25x + 20z ≤ 30 x + 2z ≤ 10 2x - z ≤ 15 -2x - 10z ≤ -15 w >= -26 w <= -22 x is a nonnegative continuous variable, z is a nonnegative integer variable. After the 1s...

Thanks Renger, appreciate the clarification! On another note, does GAMS permit tables whose elements consists of variables ? For example, if x1, x2, x3 are variables, then is the following permitted ? table d(ii,*) coefficients d1 d2 d3 d4 ... m26 x1 x1*x2 x3*x1 x1^2 m27................................

Hi Anby If you define an equation over a set, in Gams you can't write down the single equations. For this you should have defined every single equation like eq_28, eq_29. It is easier to define a table with the coefficients for the X-Variables and write down one equation definition like this: table...

Hi all, I am really struggling with the Error 150 which pops up when I run my simple script. I am a beginner with GAMS. I am using the elements of a set (within quotes) to define the individual equations, but it is giving me the error. I think it has got something to do with domain violation, but I ...