Originally posted by: Paroth2

So i have a simple linear program written in my .mod file. However, i want to use different input parameters (+10%, +20% etc...) for each run. The .dat files are all identical except the changed parameters. I used an example from this forum and added the main block into my .mod (see below) to solve these instances, however i am getting an error that .datfiles is not available. I also tried to put it into a separate mod, but still without success. I would appreciate any help.

{string} datFiles={"+10% N.dat","+20% N.dat"};
main{
var src = new IloOplModelSource("Fall 2_NP.mod");
var cplex = new IloCplex();
var def = new IloOplModelDefinition(src);
    for(var datFile in thisOplModel.datFiles){
        var opl = new IloOplModel(def, cplex);    
        var data = new IloOplDataSource(datFile);
        opl.addDataSource(data);
        var details=opl.dataElements;
        opl.generate();
        if(cplex.solve()){
        writeln("Gesamtkosten =" + cplex.getObjValue());}
        else{
            writeln("No Solution");}
}}

Hi,

if I run

{string} datFiles={"+10% N.dat","+20% N.dat"};
main{
var src = new IloOplModelSource("Fall 2_NP.mod");
var cplex = new IloCplex();
var def = new IloOplModelDefinition(src);
    for(var datFile in thisOplModel.datFiles){
        var opl = new IloOplModel(def, cplex);    
        var data = new IloOplDataSource(datFile);
        opl.addDataSource(data);
        var details=opl.dataElements;
        opl.generate();
        if(cplex.solve()){
        writeln("Gesamtkosten =" + cplex.getObjValue());}
        else{
            writeln("No Solution");}
}}

with .mod

int maxOfX=...;
 
 dvar int x;
 maximize x;
 subject to
 {
 x==maxOfX;
 }

and .dat

maxOfX=10;

and

maxOfX=20;

I get

Gesamtkosten =10
Gesamtkosten =20

regards

https://www.linkedin.com/pulse/making-decision-optimization-simple-alex-fleischer/