Originally posted by: GACNEU

Please find my project in the attachment.

I have a model in DistributionNetwork.mod.

and i want to call the model in another model file SensitiveAnalyze.mod

two problems i have here.

firstly, in SensitiveAnalyze.mod, if coef vary from 0.1 to 1, such as "for(var coef = 1; coef<=1; coef=coef+0.1)"

it shows "3DCs are selected" when coef = 1

and if coef vary from 1.0 to 1.0, such as "for(var coef = 1; coef<=1; coef=coef+0.1)"

it shows "1DCs are selected" when coef = 1

how weird it is

second, in the simple model DistributionNetwork.mod, i have a contraint named "ct"

and i want to change its coef in SensitiveAnalyze, but errors are reported

how to deal with this errors.

Thanks a lot for you attention!

hi,

for the first question, numerical differences may lead to different equivalent questions

for the second question:

can you change

Problem.ct.setCoef(Problem.X[j],coef*Problem.FixCost[j]);

into

cplex.setCoef(Problem.ct,Problem.X[j],coef*Problem.FixCost[j]);

and

ct:    TotalFixCost  = sum(j in PossibleDC)FixCost[j]*X[j];

into

ct:    TotalFixCost  - sum(j in PossibleDC)FixCost[j]*X[j]==0;

regards

Originally posted by: GACNEU

Thanks a lot, it works to my second problem.

As for the first problem, i built a simple example to demonstrate what i mean.

in T.mod:

dvar int X in 0 .. 10;
dvar int Y in 0 .. 10;
maximize X + Y;
subject to{X + Y <= 10;}

and in TT.mod:

main
{
  var source = new IloOplModelSource("T.mod");
 var cplex = new IloCplex();
 var def = new IloOplModelDefinition(source);
 var Problem= new IloOplModel(def,cplex);
 Problem.generate();
 for(var coef =  0.5; coef<=1.5; coef=coef+1)             //This make the coefficient of X equal to 0.5 and 1.5
 {
     writeln("-----------coef = ",coef,"-----------");
  cplex.setObjCoef(Problem.X,coef);
  cplex.solve();
  writeln("Objective Value = ", cplex.getObjValue());
  writeln("X=",Problem.X);
  writeln("Y=",Problem.Y);
 }
 Problem.end();
 def.end();
 cplex.end();
 source.end();
} 

In log, it says:

-----------coef = 0.5-----------
Objective Value = 10
X=0
Y=10
-----------coef = 1.5-----------
Objective Value = 15
X=0
Y=10

Obviously, the objective value is right, but the value of decision variables are wrong,

why and how?

Hi,

we recommend to call postProcess:

can you turn

cplex.solve();
 writeln("Objective Value = ", cplex.getObjValue());

into

cplex.solve();
Problem.postProcess();
writeln("Objective Value = ", cplex.getObjValue());

?

regards

Originally posted by: GACNEU

Grateful.  the problem is done.