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.
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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.
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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.
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Related controls
Integer
|
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