Originally posted by: Margarett

Hello! 

I have the simplest linear programming problem with indicative (boolean) variables. 

Cplex gives me the 2 error messages: 

1) Error: Exception from IBM ILOG Concert: IloModelI

2) IloModelI

 

(?) Please tell me how I need to correct the code to get the correct answer.

 

Below is the task code. 

The solution to this problem should be:   a=1, x=6. 

 

using CP; 
dvar boolean a;
dvar int x in 1..10;

maximize (a+x);

subject to
{ 
 if (x>=4) a==1;
 else      a==0;

 a+x<=7;
}

 

 

 

 

Best regards, 

Margarett. 

 

 

#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi,

you could write

using CP;
dvar boolean a;
dvar int x in 1..10;

maximize (a+x);

subject to
{
 a== (x>=4);

 a+x<=7;
}

which gives

 

// solution with objective 7
a = 1;
x = 6;

regards

 

https://www.linkedin.com/pulse/%D1%87%D1%82%D0%BE-%D1%82%D0%B0%D0%BA%D0%BE%D0%B5-%D0%BE%D0%BF%D1%82%D0%B8%D0%BC%D0%B8%D0%B7%D0%B0%D1%86%D0%B8%D1%8F-%D0%B8-%D0%BA%D0%B0%D0%BA-%D0%BE%D0%BD%D0%B0-%D0%BC%D0%BE%D0%B6%D0%B5%D1%82-%D0%BF%D0%BE%D0%BC%D0%BE%D1%87%D1%8C-%D0%B2%D0%B0%D0%BC-%D0%B1%D0%BE%D0%BB%D1%8C%D1%88%D0%B5-fleischer/

#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: Margarett

Thank you so much, AlexFleischer! 

The program works really well. 

Thank you!

#DecisionOptimization
#OPLusingCPLEXOptimizer