topic Proc Optmodel Result: Why is Objective = 0? in Mathematical Optimization, Discrete-Event Simulation, and OR

Proc Optmodel Result: Why is Objective = 0?

genemroz — Mon, 13 Oct 2025 20:01:22 GMT

I've been running this Proc Optmodel code successfully for some time. On a recent run, the code failed to produce the expected result . There are two observations in the stations matrix but the output datasets work.initialsolution_roo and work.optimalsolution_roo contain only one observation where I expected two. I see in the log the following Note: Objective=0 and am wondering if that could be the cause and, if so, what does it mean if the Objective = 0? The log is attached. Let me know if you need something further.

Thanks in advance for any insights you can offer,

Gene

Re: Proc Optmodel Result: Why is Objective = 0?

RobPratt — Tue, 14 Oct 2025 15:55:24 GMT

When there are two stations and each one can use at most one orientation, it is not possible for a target to be triply covered, so IsTriplyCovered[t] = 0 for all t, and the maximum objective value is 0. There are multiple optimal solutions, and the one returned by the solver has only one CHI variable > 0.5.

Re: Proc Optmodel Result: Why is Objective = 0?

genemroz — Wed, 15 Oct 2025 01:03:23 GMT

Sorry to be tardy responding. Well, yes, of course! I should’ve seen that two stations can’t get triply cover any target. But your comment suggested to me a path to an alternative solution. Thanks so much for your patience and help.

Gene