I have a straightforward (I hope) issue that I have been grappling with all day. I am trying to name a 2D decision variable in C++ using concert technology. My model is a real life assignment problem - so I need to index my variables with the actual resource and task names in order to provide the solution to the decision makers. This is easy with OPL using tuples. However, I am confused with concert technology. I have 2 decision variables (a) a 2D variable boolean variable that indicates which resource has been assigned to which task, and (b) a 1D boolean indicator variable that indicates if a particular resource has been selected in the assignment solution. It has been straightforward to name the 1D variable. I have the following Map which holds the name of the resources and their experience levels. I use this Map to iterate the variable and name it as follows:
map<string, string> Map; // The first string holds the name and the second string the experience level
IloNumVarArray Y(env); // My 1D variable
map<string, string>::iterator Name; // Iterator for the Map
for (Name = Map.begin(); Name != Map.end(); Name++)
{
string getName = Name->first;
char convertedName[100];
strcpy_s(convertedName, getName.c_str());
Y.add(IloNumVar(env, 0, 1, ILOINT, convertedName));
}
So how do I do the following for the 2D variable. It is of the form Xij where i is the Resource Name and j is the Task Name. I have declared the variable as follows:
IloArray<IloNumVarArray> X;
I have another Map which indicates the fit between i & j. It is:
Map<string, map<string, float>> fitMap; //first string is the resource name, second string is the` task name and the float is the fit value.
Any ideas will be very appreciated!
I have often found it easiest to just do the naming in a separate loop over all the variables in an array, so something like (apologies for the approximate syntax):
for (i=0; i<M; i++)
for (j=0; j<N; j++)
X[i][j].setName(resourceName[i] + "_" + taskName[j]);
Obviously the setName() calls could be folded into the loop(s) where you actually create the variables if that is more convenient
But I never use the naming of the variables to convey useful information other than for my own debugging etc. I would usually walk over the variables in my code and use the values from CPLEX to decide what to draw in a user interface, create reports etc. based on the solution
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