Reset the model to an unsolved state, discarding any previously computed solution information.
A non-zero return value indicates that a problem occurred while resetting the model. 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 to reset.
clearall: Should additional information such as MIP starts, variable hints, branching priorities, lazy flags, and partition information be cleared.
error = GRBreset(model, 0);