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# XPRSgetobjdblcontrol

Purpose
Retrieves the value of a given double control parameter associated with an objective function. These parameters control how the objective is treated during multi-objective optimization.
Topic areas
Controls and Attributes, Multiobjective
Synopsis
`int XPRS_CC XPRSgetobjdblcontrol(XPRSprob prob, int objidx, int control, double* p_value);`
Arguments

prob | The current problem.
objidx | Index of the objective to query.
control | Control parameter whose value is to be returned. Must be one of:
XPRS_OBJECTIVE_WEIGHT | get the weight of the given objective;
XPRS_OBJECTIVE_ABSTOL | get the absolute tolerance of the given objective;
XPRS_OBJECTIVE_RELTOL | get the relative tolerance of the given objective;
XPRS_OBJECTIVE_RHS | get the constant term of the given objective.
p_value | Pointer to a double where the control value will be returned.

Example
The following obtains the weight of the first objective and outputs it to screen:

    double weight;
    XPRSgetobjdblcontrol(prob,1,XPRS_OBJECTIVE_WEIGHT,&weight);
    printf("Weight is %g\n",weight);

Related topics
XPRSsetobjdblcontrol, XPRSgetobjintcontrol, XPRSsetobjintcontrol.
Parent Topic Console and Library Functions

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