Originally posted by: MSaqib

Hi everyone
I have written a main script in my OPL model file. It's purpose is to invoke the model with different data values over an over in a loop. Furthermore, I'm trying to do some fine tuning based on the results of the optimization. My model defines a variable:

dvar 

boolean bootup[AVAIL_LOCATIONS][PUREINTERVALS];

that is, a two dimensional decision variable array. After the solver has found a solution, I am trying to write the value of this array to a file.

if (cplex.solve()) 
{ 

for(var q = 1 ; q <= rb1.interval_size ; q++) 
{ var filename = 
"planned" + o + 
"." + i + 
"." + q + 
".dat"; var planfile = 

new IloOplOutputFile(filename); planfile.write(
"INIT_WORKLOAD=["); 

for(var p = 1 ; p <= rb1.availLocations ; p++) planfile.write(rb1.x[p][q] + 
" " ); planfile.write(
"];"); planfile.close(); 
} 

for(k = 1 ; k <= o ; k++) 
{ f1.write(
"INIT_BOOTUP=["); 

for (dabba = 1 ; dabba <= rb1.availLocations ; dabba++) 
{ f1.write(rb1.bootup[dabba][k]); f1.write(
" "); 
} f1.writeln(
"];"); 
} f1.close(); 
}

What I get in the file is a line like this:

INIT_BOOTUP=[[a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] [a IloNumVar] ];

What does

[a IloNumVar]

mean? I have tried a number of things but to no avail. Done web searches as well as looked through the documentation but didn't find anything. I'm attaching the model file with this post.
Thanks in advance for the help.
Best regards
Saqib
#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi,

a reason why you get this IloNumVar may be the fact that you did not solve your model.

For example

dvar float+ Gas;
dvar float+ Chloride;
 
maximize
  40 * Gas + 50 * Chloride;
subject to {
  ctMaxTotal:     
    Gas + Chloride <= 50;
}
 
main
{
 thisOplModel.generate();
 //cplex.solve();
 writeln(thisOplModel.Chloride);
 }

gives

[IloNumVar]

whereas if you uncomment cplex.solve you'll get the real value

Regards
#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi,

a reason why you get this IloNumVar may be the fact that you did not solve your model.

For example

dvar float+ Gas;
dvar float+ Chloride;
 
maximize
  40 * Gas + 50 * Chloride;
subject to {
  ctMaxTotal:     
    Gas + Chloride <= 50;
}
 
main
{
 thisOplModel.generate();
 //cplex.solve();
 writeln(thisOplModel.Chloride);
 }

gives

[IloNumVar]

whereas if you uncomment cplex.solve you'll get the real value

Regards
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: MSaqib

Thanks for the reply Alex. However, if you notice, I have called cplex.solve on the model prior to trying to access the model variables. One thing that I noticed is that in the for loop involving the variable k, the first time through the loop, I get the expected real values, but the second time through the loop, when k = 2, I get those strange values for

bootup[dabba][k]

Any other clues?
#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi

and what happens if you replace

f1.write(rb1.bootup[dabba][k]);

by

f1.write(rb1.bootup[dabba][k].solutionValue);

?

Regards
#DecisionOptimization
#OPLusingCPLEXOptimizer