I am trying to add stochasticity to a deterministic MIP model and I am receiving the following message:
The empty row em.Stochastic([M,L,L,L],(B),(B)) .. 0 <= -39688691.0796 is infeasible, as tolerance the option "Bound_Tolerance" is used with value 1e-08.
This constraint is:
index= (i,j) - at the error message (B) is i and (B) is j;
definition sum((k,t), Flow(k,i ,j ,t)) <= sum((e,t),EmissionProfile(e,t))
EmissionProfile is the parameter with the scneario tree and Flow is the stochastic variable. Worth to mention the deterministic model is running with no issues
I appreciate any light on this topic or how to debug it.
Thanks and best regards,
Best answer by Chris Kuip
From what you share, I note:
- A negative RHS. During generation, AIMMS will move the value of fixed/frozen variables to the RHS. Can you check whether there are any fixed/frozen flow variables, perhaps because t is an index in a Horizon?
- Usually, there is no flow when the from and the to are the same. So I do not understand why a constraint is generated. Can you check the index domain condition on the constraint "em?
Perhaps the above questions help you find the answer.
With kind regards,