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XPRSaddcbbarlog

Purpose
Declares a barrier log callback function, called at each iteration during the interior point algorithm. This callback function will be called in addition to any barrier log callbacks already added by XPRSaddcbbarlog. This functionality is not available for the hybrid gradient method.
Topic areas
Callback, Barrier
Synopsis
int XPRS_CC XPRSaddcbbarlog (XPRSprob prob, int (XPRS_CC *barlog)(XPRSprob cbprob, void *cbdata), void *data, int priority);
Arguments
prob 
The current problem.
barlog 
The callback function itself. This takes two arguments, cbprob and cbdata, and has an integer return value. If the value returned by barlog is nonzero, the solution process will be interrupted. This function is called at every barrier iteration.
cbprob 
The problem passed to the callback function, barlog.
cbdata 
The user-defined data passed as data when setting up the callback with XPRSaddcbbarlog.
data 
A user-defined data to be passed to the callback function, barlog.
priority 
An integer that determines the order in which multiple barrier log callbacks will be invoked. The callback added with a higher priority will be called before a callback with a lower priority. Set to 0 if not required.
Example
This simple example prints a line to the screen for each iteration of the algorithm. 
XPRSaddcbbarlog(prob,barLog,NULL,0);
XPRSlpoptimize(prob,"b");
The callback function might resemble: 
int XPRS_CC barLog(XPRSprob prob, void *data)
{
  printf("Next barrier iteration\n");
}
Further information
If the callback function returns a nonzero value, the Optimizer run will be interrupted.
Related topics
XPRSremovecbbarlog, XPRSaddcbmiplog, XPRSaddcblplog, XPRSaddcbmessage.

Parent Topic Console and Library Functions

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