Originally posted by: RaRaChen

hello! Everyone I'm a new hand on CPLEX. I meet a problem on it, the question as following:
For example, I have to transport a product by truck/ship in period=1, and travel time is 1 period(truck) or 2 periods(ship). Travel time is based on the transportation mode choose. Finally the arrival period must less than the total periods.
int period=…;
range periods=1..period;
{string} transportation_mode=…;
int traveltimetransportation_mode=…
int arrival_period =…;
arrival_period = period+ traveltimetransportation_mode
and arrival_period <=period
.
Is there any keyword or code I need. I don’t know how to do. Could you please give me an answer?
Thanks a lot
RaRaChen
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#DecisionOptimization

Originally posted by: SystemAdmin

CPLEX comes with tons of examples and the distribution also has several tutorials. Did you look at any of them to learn how to write an optimization model in OPL? All the documentation is available online here. Maybe start with "IDE and OPL" section.
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Originally posted by: RaRaChen

Dear DanielJunglas

I have read the examples for a long time, but I still can not find what's wrong with it. Maybe I loss something. Cplex can not mix one dimension and two dimension together. I need t + t,m <=T(t+ t,m=at(arrival period)).The "at" will trade off my decision variable.

thanks a lot
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