Originally posted by: JennyKid

Hi all,

I get stuck with this code:

The 3 summations I use for this code can not be extracted.

//Data
int m = ...;
{string} ObjectN = ...;
{string} ClusterK= ...;
{string} VariableP= ...;
float SampleObjectNVariableP = ...;

//Variables
dvar boolean GradeBelongObjectNClusterK;
dvar float ElementMatrixClusterKVariableP;

//Objective
dexpr float Sum1 = sum( i in ObjectN )
sum( k in ClusterK )
sum( a in VariableP )
GradeBelong[i][k]*(Sample[i][a]-ElementMatrix[k][a])^2;

minimize Sum1;

//Constraints
subject to {
forall( i in ObjectN )
ctUik:
sum( k in ClusterK )
GradeBelong[i][k] == 1;

}
The error is "Cannot extract model".

Could anyone please help me?

Thanks in advance.
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

Your expression

GradeBelong[i][k]*(Sample[i][a]-ElementMatrix[k][a])^2;

is cubic, which is not supported by CPLEX.

If you formulate with

dvar int GradeBelong

you can use CP, adding the 'using CP' clause.

Tschau, Frank
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: doilangthang

Thank you, Frank!

It helps but I have to change my variable of ElementMatrixClusterKVariableP to integer while it's not boolean.

"Using CP" just helps for int var.

Thank so much!
#DecisionOptimization
#OPLusingCPLEXOptimizer