The C interface defines a symbolic constant for each parameter. The
symbolic constant name is prefixed by
type is either
STR. This is
followed by the capitalized parameter name. For example, the symbolic
constant for the integer Threads
parameter (found in C header file
#define GRB_INT_PAR_THREADS "Threads"
The routine you use to modify a parameter value depends on the type of the parameter. For a double-valued parameter, you would use GRBsetdblparam.
Recall that each model gets its own copy of the environment when it is created. Parameter changes to the original environment therefore have no effect on existing models. You'll need to use GRBgetenv to retrieve the environment associated with a particular model if you want to change a parameter for that model.
To set the TimeLimit parameter for a model, you'd do:
error = GRBsetdblparam(GRBgetenv(model), GRB_DBL_PAR_TIMELIMIT, 100.0);
If you'd prefer to use a string for the parameter name, you can also do:
error = GRBsetdblparam(GRBgetenv(model), "TimeLimit", 100.0);The case of the string is ignored, as are underscores. Thus,
Use GRBgetdblparam to query the current value of a (double) parameter:
double currentvalue; error = GRBgetdblparam(modelenv, "TimeLimit", ¤tvalue);