<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Yunzhuang,<br class=""><br class="">Thank you for your question.<br class=""><br class="">SCIP only allows one diving heuristic to be called at a node. This is set in line 287 of file „heuristics.c“ in function „SCIPperformGenericDivingAlgorithm“. To allow all diving heuristics to run at a node, you have to comment out this part of the code.<br class=""><br class="">Furthermore, there exist two parameters „freq“ and „freqofs“ determining how often a heuristic is called. The parameter „freq“ sets the frequency for calling primal heuristics and „freqofs“ the frequency offset. These parameters can be changed by adding „heuristics/name_of_heuristic/freq = x“ and „heuristics/name_of_heuristic/freq = y“, respectively, to your settings file.<br class=""><br class="">I hope this answers your question.<br class=""><br class="">Best,<br class="">Antonia<br class=""><br class=""><blockquote type="cite" class="">Betreff: <span class="Apple-tab-span" style="white-space: pre;"> </span>[SCIP] Runing frequency of primal heuristics<br class="">Datum: <span class="Apple-tab-span" style="white-space: pre;"> </span>Thu, 4 Jun 2020 10:28:52 +0000<br class="">Von: <span class="Apple-tab-span" style="white-space: pre;"> </span>Yunzhuang Shen <<a href="mailto:s3640365@student.rmit.edu.au" class="">s3640365@student.rmit.edu.au</a>><br class="">An: <span class="Apple-tab-span" style="white-space: pre;"> </span><a href="mailto:scip@zib.de" class="">scip@zib.de</a> <<a href="mailto:scip@zib.de" class="">scip@zib.de</a>><br class=""><br class=""><br class=""><br class="">Hi SCIP Team,<br class=""><br class="">I am evaluating primal heuristics on Setcover problem. I cannot find why diving heuristics run infrequently on this problem. Can you please indicate possible reasons?<br class=""><br class="">Regards,<br class="">yunzhuang</blockquote></body></html>