Originally posted by: guabiik

Hi, 

I'm using Cplex in C to solve a big amount of problems, i have the diferent data in .txt, so i want to read the parameters and define the problem. I have "n" numbers of nodes, 3*n+2 variables and 3*n constraints, so i want to find a way to define this in reference to a constant "n".

I think that the objective is a vector, but i couldn't define it like one ("obj[n]").

Can you define this things with loops or a auxiliar array?

Thanks

Have you looked at the various C examples that are shipped with CPLEX?

If you find yourself trying to do something like 'obj[n]' (where 'n' is a variable) then you should probably also check a C programming manual about dynamic allocation of memory in C.

Originally posted by: guabiik

Yes, now i have looked better. Thanks.

But, i have another problem. I'm using now a CPXaddrows and CPXnewcols, with a and b are integers:

        int status;

        if ( (status=CPXnewcols(env , lp , a, obj,lb, ub, NULL, cname)) != 0 )
      goto TERMINATE;
        
        if ( (status=CPXaddrows(env , lp , 0, b , 2*b , rhs , sense, rbeg, rind, rval, NULL, NULL)) != 0 )
      goto TERMINATE;

but i have errors:

cplex2.c:667:63: warning: passing argument 8 of 'CPXaddrows' from incompatible pointer type [-Wincompatible-pointer-types]
  if ( (status=CPXaddrows(env , lp , 0, b , 2*b , rhs , sense, rbeg, rind, rval, NULL, NULL)) != 0 )
                                                               ^
In file included from cplex2.c:3:0:
C:/Program Files/IBM/ILOG/CPLEX_Studio1261/opl/include/ilcplex/cplex.h:62:4: note: expected 'const int *' but argument is of type 'double *'
    CPXaddrows (CPXCENVptr env, CPXLPptr lp, int ccnt, int rcnt,
    ^
cplex2.c:667:69: warning: passing argument 9 of 'CPXaddrows' from incompatible pointer type [-Wincompatible-pointer-types]
  if ( (status=CPXaddrows(env , lp , 0, b , 2*b , rhs , sense, rbeg, rind, rval, NULL, NULL)) != 0 )
                                                                     ^
In file included from cplex2.c:3:0:
C:/Program Files/IBM/ILOG/CPLEX_Studio1261/opl/include/ilcplex/cplex.h:62:4: note: expected 'const int *' but argument is of type 'double *'
    CPXaddrows (CPXCENVptr env, CPXLPptr lp, int ccnt, int rcnt,
    ^