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RobPratt
SAS Super FREQ

Your Trigger constraint contains a product of decision variables and hence is nonlinear.  Also, it is redundant because the left hand side is a sum of nonnegative summands.  If you remove this constraint, the MILP solver will return an optimal solution with InspectDecision[j] = 0 for all j.

 

What logical condition on the other decision variables do you want to force InspectDecision[j] = 1?

m3lon00
Calcite | Level 5

I wanted to enfore that the trigger was 1 and multipled by the fixed cost for any of the Ts facilities that received any shipments at all. 

RobPratt
SAS Super FREQ

In other words, you want inflow[i,j] > 0 to force InspectDecision[j] = 1.  Hint: You can do that by introducing InspectDecision[j] into the xMaxP constraint while keeping that constraint linear.

 

m3lon00
Calcite | Level 5

I figured it out, thank you so much for your help

PGStats
Opal | Level 21

@m3lon00, did you purposely delete your question statement?

PG

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