https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318451#M1591 <P><a href="https://communities.sas.com/t5/user/viewprofilepage/user-id/119396">@m3lon00</a>, did you purposely delete your question statement?</P> Tue, 13 Dec 2016 04:56:24 GMT PGStats 2016-12-13T04:56:24Z https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318440#M1585 <P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Tue, 13 Dec 2016 04:32:41 GMT https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318440#M1585 m3lon00 2016-12-13T04:32:41Z https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318444#M1586 <P>Your Trigger constraint contains a product of decision variables and hence is nonlinear.&nbsp; Also, it is redundant because the left hand side is a sum of nonnegative summands.&nbsp; If you remove this constraint, the MILP solver will return an optimal solution with InspectDecision[j] = 0 for all j.</P> <P>&nbsp;</P> <P>What logical condition on the other decision variables do you want to force InspectDecision[j] = 1?</P> Tue, 13 Dec 2016 04:05:52 GMT https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318444#M1586 RobPratt 2016-12-13T04:05:52Z https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318445#M1587 <P>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.&nbsp;</P> Tue, 13 Dec 2016 04:11:32 GMT https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318445#M1587 m3lon00 2016-12-13T04:11:32Z https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318449#M1589 <P>In other words, you want inflow[i,j] &gt; 0 to force InspectDecision[j] = 1.&nbsp; Hint: You can do that by introducing&nbsp;InspectDecision[j] into&nbsp;the xMaxP constraint while keeping that constraint linear.</P> <P>&nbsp;</P> Tue, 13 Dec 2016 04:34:23 GMT https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318449#M1589 RobPratt 2016-12-13T04:34:23Z https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318450#M1590 <P>I figured it out, thank you so much for your help</P> Tue, 13 Dec 2016 04:40:19 GMT https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318450#M1590 m3lon00 2016-12-13T04:40:19Z https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318451#M1591 <P><a href="https://communities.sas.com/t5/user/viewprofilepage/user-id/119396">@m3lon00</a>, did you purposely delete your question statement?</P> Tue, 13 Dec 2016 04:56:24 GMT https://communities.sas.com/t5/Mathematical-Optimization/Error-the-nlp-solver-does-not-allow-integer-variables/m-p/318451#M1591 PGStats 2016-12-13T04:56:24Z