GAMS World Forum

Hi, MPS is a file format for linear problems: https://en.wikipedia.org/wiki/MPS_(format) If you look into the resulting mps file, you should see hints like * Cannot handle NLP [...] * Cannot handle nonlinear equations, nonlinear part ignored. * Cannot handle nonlinear equations, nonlinear part ignor...

Hi, you are absolutely right. I edited my post accordingly.

Fred

Hi, So you want a constraint that calculates the sum of all distances w(p1,p2) between pixels p1 and p2 on which a house h is built? I think a straightforward (quadratic) formulation could look as follows: equation houseDistNL; positive variable distNL; alias(h,h1,h2), (p,p1,p2); houseDistNL.. distN...

Hi, The dynamic set won't help if you need that during the solution process. I guess there are model formulations that do what you want but it is a bit tedious to guess how this could fit into an unknown model. If you share your model and explain where you are struggling to find the right formulatio...

Hi, Your syntax is almost corrrect. It only misses the level attribute of the variable (https://www.gams.com/latest/docs/UG_Variables.html#UG_Variables_VariableAttributes) and it seem that h is a set elemnt which means it should be quoted. Also, I suggest not to test for equality (due to tolerances ...

Hi, I think the following example should do the trick. binary variable y(i,l) 'worker i works on day l'; variable start(i,l) 'value of 1 indicates that worker i starts to work on day l'; equation defStart(i,l) minconsec(i,l); defStart(i,l).. start(i,l) =e= y(i,l) - y(i,l-1); minconsec(i,l)$(ord(l)>1...

Hi, If you look into the listing file, the first error you get is **** $66,256,299 UNEXPECTED END OF FILE (1) **** 3 ERROR(S) 0 WARNING(S) After adding a semicolon after the solve statement yo get 79414 solve MEPI using mip minimizing of; **** $66,256 **** LINE 251 INPUT C:\Users\user\Documents\supp...

Hi, Your model is (integer) infeasible. So there is no feasible point to all the constraints and integrality requirements you have specified. You either made a mistake implementing some constraint, or the combination of model and data really allows for no feasible solution. This state of the optimiz...

Hi,

To help you it would be good to know how exactly your code fails (share log, lst and files to reproduce). If I adopt your code snippet to model from the model library, everything works as expected.

Best,
Fred

Hi,

The Baron options DeltaTerm, DeltaT, DeltaR, DeltaA seem to be what you are looking for: https://www.gams.com/latest/docs/S_BARO ... ermination

I hope this helps!

Fred