Initializing help system before first use

XPRSsetobjdblcontrol

Purpose
Sets the value of an double control parameter associated with an objective. These control values will only be applied when solving the given objective during multi-objective optimization.
Topic areas
Controls and Attributes, Multiobjective
Synopsis
int XPRS_CC XPRSsetobjdblcontrol(XPRSprob prob, int objidx, int control, double value);
Arguments
prob 
The current problem.
objidx 
Index of the objective to modify.
control 
Control parameter whose value is to be modified. Can be any solver control, or one of:
XPRS_OBJECTIVE_WEIGHT 
set the weight of the given objective;
XPRS_OBJECTIVE_ABSTOL 
set the absolute tolerance of the given objective;
XPRS_OBJECTIVE_RELTOL 
set the relative tolerance of the given objective;
XPRS_OBJECTIVE_RHS 
set the constant term of the given objective.
value 
Value to which the control parameter is to be set.
Example
The following sets the weight of the first objective to 0,5: 
XPRSsetobjdblcontrol(prob, 0, XPRS_OBJECTIVE_WEIGHT, 0,5);
The following sets a limit on the number of cuts and cut coefficients the optimizer is allowed to add while solving the second objective only: 
XPRSsetobjdblcontrol(prob, 1, XPRS_CUTFACTOR, 0,5);
See also example goalprog.c.
Further information
1. When XPRS_OBJECTIVE_WEIGHT is zero, the objective is disabled and will be ignored when solving. If all objectives with a given priority have zero weight, no solve will take place for that priority value.
2. When TIMELIMIT, SOLTIMELIMIT or WORKLIMIT is set on an objective, then when the limit is reached the solver will stop the current solve but will continue with solving the next objective. This is in contrast to the behaviour when these controls are set on the problem with XPRSsetdblcontrol, where the overall optimization will be terminated as soon as a limit is reached.
3. This function cannot be called while the current problem is being solved or when it is in an interrupted state. Use XPRSpostsolve to restore the problem to a non-solving state.
Related topics
XPRSgetobjdblcontrol, XPRSgetobjintcontrol, XPRSsetobjintcontrol.

Parent Topic Console and Library Functions

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