Initializing help system before first use

XPRBgetobjval

XPRBgetobjval

Purpose
Get the objective function value.
Synopsis
double XPRBgetobjval(XPRBprob prob);
Argument
prob 
Reference to a problem.
Return value
Current objective function value, default and error return value: 0.
Example
The following provides an example of retrieving the objective function value. 
XPRBprob expl2;
double objval;
expl2 = XPRBnewprob("example2");
 ...
XPRBlpoptimize(expl2, "");
objval = XPRBgetobjval(expl2);
Further information
This function returns the current objective function value from the Xpress Optimizer. If it is called after completion of a global search and an integer solution has been found (that is, if function XPRBgetmipstat returns values XPRB_MIP_SOLUTION or XPRB_MIP_OPTIMAL), it returns the value of the best integer solution. In all other cases, including during a global search, it returns the solution value of the last LP that has been solved. If this function is used during the execution of an optimization process (for instance in Optimizer library callback functions) it needs to be preceded by a call to XPRBsync with the flag XPRB_XPRS_SOL.
Related topics
XPRBgetdual, XPRBgetrcost, XPRBgetsol, XPRBgetslack, XPRBgetact, XPRBsync.

Parent Topic BCL C library functions

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