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<div class="moz-cite-prefix">Hi Cristina,<br>
<br>
the heuristic frequency and frequency offset are responsible for
deciding whether or not to apply a heuristic at a given node. A
heuristic is generally applied at every node in depth d if d >=
heurfreqoffset and (d - heurfreqoffset) % heurfreq == 0. <br>
In addition, the heuristic timing, which cannot be set as a user
parameter, but only when compiling SCIP, plays a role; Diving
heuristics,<br>
e.g., are only executed if SCIP is about to leave the current path
in the branch and bound tree.<br>
<br>
If you want it executed once per node, a heuristic timing
SCIP_HEURTIMING_AFTERNODE is fine, or more often with
SCIP_HEURTIMING_DURINGLPLOOP, if your heuristic is computationally
inexpensive as, e.g., rounding heuristics usually are.<br>
<br>
Please have a look at our doxygen documentation about how to add
primal heuristics:<br>
<a class="moz-txt-link-freetext" href="http://scip.zib.de/doc/html/HEUR.php">http://scip.zib.de/doc/html/HEUR.php</a><br>
<br>
Best regards,<br>
Gregor<br>
<br>
<br>
<br>
On 04/24/2014 03:36 PM, Cristina Núñez del Toro wrote:<br>
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<div>Hello,<br>
<br>
</div>
I'm kind of a SCIP beginner. I would like to know how to
implement an heuristic algorithm for each exploration node
in order to obtain a integer solution. <br>
<br>
As far as I know, SCIP has several heuristics. What I'm not
clear is about how to impose the use of a specific one while
exploring each of the nodes. <br>
<br>
</div>
Thank you for your help in advance,<br>
<br>
</div>
Best Regards,<br>
<div>
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<div>
<div>
<div><br>
---<br>
Cristina Nuñez<br>
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