CPLEX C++ get the index of variable by variable name

Question

Is it possible in CPLEX optimizer, with c++ api, to get the index of a variable by the variable name? I couldn't find any suitable method to do that. Plz help.

I have [IloNumVarArray vars;] variable to store variables by name.

vars[i].getName(); // gives the name of the variable at index i

Is there any method like : vars.getIndex(name), which can give the index of the variable?

Answer 1

There isn't anything like that in CPLEX.

You can always iterate the array and compare the name to get back your variable. If you need better performance you can use a map.

Answer 2

If you are using the callable library C++ API, there is function for finding the column index, given a column name:

int CPXgetcolindex(CPXCENVptr env, CPXCLPptr lp, const char * lname_str, int * index_p)

See:

http://pic.dhe.ibm.com/infocenter/cosinfoc/v12r4/index.jsp?topic=%2Filog.odms.cplex.help%2Frefcallablelibrary%2Fhtml%2Ffunctions%2FCPXaddmipstarts.html