Hello everyone I am trying to model a VRPTW, rather a Dial a ride problem using MathProg, to be solved with glpsol. I started from the base code by Jeffrey Kantor shared on this mailing list, but faced the error: "Operand preceding = has invalid type" while trying to implement a constraint for maximum number of stops that should be there between a customer's start and end node. Could someone be kind enough to look at the code and help me understand the reason for this error and how I can correctly implement this constraint?
I have attached the file here. Thanks Navjot Kukreja
aircraft.mod
Description: Binary data
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