int GRBgetgenconstrExpA ( GRBmodel *model,
    int id,
    int *xvarP,
    int *yvarP,
    double *aP )

Retrieve the data associated with a general constraint of type EXPA. Calling this method for a general constraint of a different type leads to an error return code. You can query the GenConstrType attribute to determine the type of the general constraint.

See also GRBaddgenconstrExpA for a description of the semantics of this general constraint type.

Return value:

A non-zero return value indicates that a problem occurred while retrieving the data of the general constraint. Refer to the Error Code table for a list of possible return values. Details on the error can be obtained by calling GRBgeterrormsg.


model: The model that contains the desired general constraint.

id: The index of the general constraint to retrieve.

Note that any of the following arguments can be NULL.

xvarP: The index of variable <span>$</span>x<span>$</span>.

yvarP: The index of variable <span>$</span>y<span>$</span>.

aP: The base of the function.

Example usage:

  int type;
  int xvar;
  int yvar;
  double a;

  error = GRBgetintattrelement(model, GRB_INT_ATTR_GENCONSTRTYPE, 3, &type);
  if (type == GRB_GENCONSTR_EXPA) {
    error = GRBgetgenconstrExpA(model, 3, &xvar, &yvar, &a);