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XPRSaddcblplog

XPRSaddcblplog

Purpose
Declares a simplex log callback function which is called after every LPLOG iterations of the simplex algorithm. This callback function will be called in addition to any callbacks already added by XPRSaddcblplog.
Synopsis
int XPRS_CC XPRSaddcblplog(XPRSprob prob, int (XPRS_CC *f_lplog)(XPRSprob my_prob, void* my_object), void* object, int priority);
Arguments
prob 
The current problem.
f_lplog 
The callback function which takes two arguments, my_prob and my_object, and has an integer return value. This function is called every LPLOG simplex iterations including iteration 0 and the final iteration.
my_prob 
The problem passed to the callback function, f_lplog.
my_object 
The user-defined object passed as object when setting up the callback with XPRSaddcblplog.
object 
A user-defined object to be passed to the callback function, f_lplog.
priority 
An integer that determines the order in which multiple lplog 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.
Related controls
Integer
LPLOG 
Frequency and type of simplex algorithm log.

Example
The following code sets a callback function, lpLog, to be called every 10 iterations of the optimization: 
XPRSsetintcontrol(prob,XPRS_LPLOG,10);
XPRSaddcblplog(prob,lpLog,NULL,0);
XPRSreadprob(prob,"problem","");
XPRSmipoptimize(prob,"");
The callback function may resemble: 
int XPRS_CC lpLog(XPRSprob my_prob, void *object)
{
  int iter; double obj;

  XPRSgetintattrib(my_prob, XPRS_SIMPLEXITER, &iter);
  XPRSgetdblattrib(my_prob, XPRS_LPOBJVAL, &obj);
  printf("At iteration %d objval is %g\n", iter, obj);
  return 0;
}
Further information
If the callback function returns a nonzero value the solution process will be interrupted.
Related topics
XPRSremovecblplog, XPRSaddcbbarlog, XPRSaddcbgloballog, XPRSaddcbmessage.

Parent Topic Console and Library Functions

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