Originally posted by: pickup

Hi, 

i have a problem : i want to introduce this constraint in cplex   

Xijv decision varibale  improuve if arc ij is crossed bye vehicul v

Fiv : decison variable indicate the departure time from node i with vehicule j

Z : decion variable 

M :  a big variable

if (Xijv=1)   then Fiv + Tij<= Fjv    ( if an arc i,j is crossed with vehicule v,  we can calculated the arrived time in node j with vehicule v) 

it's non a linear constraint , i tronsform it to a linear constraint like : 

1) Xijv <= M*Z 

2)  Fiv + Tij - Fjv  <= M* (1  - Z ) 

but when i run , solution infesable 

please can you help me

Hi,

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https://www.ibm.com/developerworks/community/forums/html/topic?id=f750277f-7b07-46fa-92e8-97722c0dcb7c&ps=25