Originally posted by: ShaCplex

Dear sir,

I am solving my model by calling 

using CP;

i have to declare a decision variable which will take real number values , not integers always. So I wrote;

dvar float AircraftDelay[aircrafts];

But it gives me an error stating " Decision variables of type dvar flaot not supported by this algorithm"

what is the way out possible? Could you please help...

Regards,

shahul

Hi,

indeed with CPO dvar float are forbidden.

But you can use dexpr float.

So Have a look at floatexpr.mod for an example.

If you néed x to be a float Var between 0 and 1.

You can write

int scale=1000;

dvar int scalex in 0..scale;

dexpr float x=scalex/scale;

regards

Originally posted by: ShaCplex

Thank you sir. 

But I think I want a couple of dvar float variables one ranging from (-inf,+inf) and the other with (0,+inf)...I could not write it.

I would like to ask you some doubts;

1. I have seen most of the models with CPO that param.timelimit declared. I know it is to specify maximum optimizer run time. But can you tell me what is the  significance of the time limit especially in CPO?

2. For a CPO model with multi-criteria(using staticLex), when I examined the engine log, some times after different iterations, the objective value is not improved and it still iterates. Is that the way CPO proceeds normally?

Regards,

shahul

Hi,

1)

TimeLimit:This parameter limits the CPU time spent solving before terminating a search. The time is given in seconds. The possible values of this parameter range from 0 to IloInfinity. A value of IloInfinity does not set any limit. The value IloInfinity is the default value.

2)

You should have a look in documentation  at CP Optimizer > CP Optimizer User's Manual > Search in CP Optimizer > The search log

regards