<span style=" font-size:10pt;font-family:sans-serif">Hi,</span><br><br><span style=" font-size:10pt;font-family:sans-serif">Just to let you
know, i entered the problem into github issues.</span><br><br><br><a href="https://github.com/coin-or/Cbc/issues/283"><span style=" font-size:10pt;color:blue;font-family:sans-serif">https://github.com/coin-or/Cbc/issues/283</span></a><br><br><br><br><br><br><span style=" font-size:10pt;color:#808080;font-family:Arial">Mit freundlichen
Grüßen / Kind regards</span><br><span style=" font-size:12pt;color:#ffbf18;font-family:Calibri">________________________________________</span><br><br><span style=" font-size:12pt;font-family:Arial"><b>Pieter Zieschang</b></span><br><br><span style=" font-size:7pt;font-family:Arial"><b>Modis IT Outsourcing
GmbH</b></span><br><span style=" font-size:7pt;font-family:Arial">Atriumstraße 1, 04315
Leipzig</span><br><br><span style=" font-size:7pt;font-family:Arial">Amtsgericht Düsseldorf:
HRB 78227</span><br><span style=" font-size:7pt;font-family:Arial">Geschäftsführer: Martin
Wimmer, Jörg Brinkmann</span><br><br><a href=https://ito.modis.de/><span style=" font-size:10pt;color:blue;font-family:Arial">ito.modis.de</span></a><br><br><br><br><br><br><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style=" font-size:9pt;font-family:sans-serif">"Pieter
Zieschang" <pieter.zieschang@modis.de></span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style=" font-size:9pt;font-family:sans-serif">"Ted
Ralphs" <ted@lehigh.edu></span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Cc:
</span><span style=" font-size:9pt;font-family:sans-serif">"cbc"
<cbc@list.coin-or.org></span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style=" font-size:9pt;font-family:sans-serif">24.01.2020
10:22</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">Re:
[Cbc] wrong optimal solution - preprocess SOS - preprocess aggregate works
fine</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: </span><span style=" font-size:9pt;font-family:sans-serif">"Cbc"
<cbc-bounces@coin-or.org></span><br><hr noshade><br><br><br><span style=" font-size:10pt;font-family:sans-serif">Hi Ted,</span><span style=" font-size:12pt"><br></span><span style=" font-size:10pt;font-family:sans-serif"><br>the version is current trunk, as of January 22th.</span><span style=" font-size:12pt"><br><br></span><span style=" font-size:10pt;font-family:sans-serif"><br>The problem is available for testing here: </span><a href=https://mega.nz/#!c3Y0CA7R!jFnYcFVzcnYSWucZrCIdgb_AQzE5etB1JlySKom1QuE><span style=" font-size:10pt;color:blue;font-family:sans-serif"><u>https://mega.nz/#!c3Y0CA7R!jFnYcFVzcnYSWucZrCIdgb_AQzE5etB1JlySKom1QuE</u></span></a><span style=" font-size:12pt"><br></span><span style=" font-size:10pt;font-family:sans-serif"><br>Command is in the post below.</span><span style=" font-size:12pt"><br><br></span><span style=" font-size:10pt;font-family:sans-serif"><br>I'm not sure if i make it to opening an issue on github today.</span><span style=" font-size:12pt"><br><br></span><span style=" font-size:10pt;font-family:sans-serif"><br>Thank you</span><span style=" font-size:12pt"><br><br></span><span style=" font-size:10pt;color:#808080;font-family:Arial"><br>Mit freundlichen Grüßen / Kind regards</span><span style=" font-size:12pt;color:#ffbf18;font-family:Calibri"><br>________________________________________</span><span style=" font-size:12pt"><br></span><span style=" font-size:12pt;font-family:Arial"><b><br>Pieter Zieschang</b></span><span style=" font-size:12pt"><br></span><span style=" font-size:7pt;font-family:Arial"><b><br>Modis IT Outsourcing GmbH</b><br>Atriumstraße 1, 04315 Leipzig</span><span style=" font-size:12pt"><br></span><span style=" font-size:7pt;font-family:Arial"><br>Amtsgericht Düsseldorf: HRB 78227<br>Geschäftsführer: Martin Wimmer, Jörg Brinkmann</span><span style=" font-size:12pt"><br></span><span style=" font-size:12pt;color:blue"><u><br></u></span><a href=https://ito.modis.de/><span style=" font-size:10pt;color:blue;font-family:Arial"><u>ito.modis.de</u></span></a><span style=" font-size:12pt"><br><br><br><br><br><br></span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>From: </span><span style=" font-size:9pt;font-family:sans-serif">"Ted
Ralphs" <ted@lehigh.edu></span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>To: </span><span style=" font-size:9pt;font-family:sans-serif">"Pieter
Zieschang" <pieter.zieschang@modis.de></span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>Cc: </span><span style=" font-size:9pt;font-family:sans-serif">"cbc"
<cbc@list.coin-or.org></span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>Date: </span><span style=" font-size:9pt;font-family:sans-serif">24.01.2020
04:36</span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>Subject: </span><span style=" font-size:9pt;font-family:sans-serif">Re:
[Cbc] wrong optimal solution - preprocess SOS - preprocess aggregate works
fine</span><span style=" font-size:12pt"><br></span><hr noshade><span style=" font-size:12pt"><br><br><br>Hi Pieter,<br><br>Forgive me if I missed something, but what Cbc version? Could you open
an issue on Github?<br><br>Ted<br><br>On Thu, Jan 23, 2020 at 5:23 AM Pieter Zieschang <</span><a href=mailto:pieter.zieschang@modis.de><span style=" font-size:12pt;color:blue"><u>pieter.zieschang@modis.de</u></span></a><span style=" font-size:12pt">>
wrote:</span><span style=" font-size:10pt;font-family:sans-serif"><br>Hello,<br><br>there seems to be something going wrong when preprocess=sos (the default)
is used, cbc selecting the wrong branch?<br><br>When preprocess=aggregate the correct optimal solution is found, also solution
time is longer, probably the</span><span style=" font-size:12pt"><br></span><span style=" font-size:10pt;font-family:sans-serif"><br><br>Correct Optimal Solution:<br><br>$ cbc Problem_25581_0.mps timemode=elapsed -seconds=400 -keepNames=on -threads=8
-dualt=1e-06 -perturb=on -pertvalue=61 -constraint=on -cuts=on -clique=forceon
-zero=forceon -probing=forceonstrong -combine=on -combine2=on -ratiogap=0.001
-multiple=8 -preprocess=aggregate -solve<br><br>Cbc0011I Exiting as integer gap of 3.0000005e-05 less than 1e-10 or 0.1%<br>Cbc0001I Search completed - best objective 180.9999999999945, took 1048
iterations and 0 nodes (117.76 seconds)<br>Cbc0035I Maximum depth 0, 289 variables fixed on reduced cost<br>Cuts at root node changed objective from 177 to 181<br>Probing was tried 108 times and created 793 cuts of which 0 were active
after adding rounds of cuts (1152.645 seconds)<br>Gomory was tried 108 times and created 441 cuts of which 0 were active
after adding rounds of cuts (25.991 seconds)<br>Knapsack was tried 108 times and created 18 cuts of which 0 were active
after adding rounds of cuts (9.414 seconds)<br>Clique was tried 108 times and created 0 cuts of which 0 were active after
adding rounds of cuts (0.226 seconds)<br>MixedIntegerRounding2 was tried 108 times and created 27 cuts of which
0 were active after adding rounds of cuts (15.430 seconds)<br>FlowCover was tried 108 times and created 0 cuts of which 0 were active
after adding rounds of cuts (6.004 seconds)<br>TwoMirCuts was tried 108 times and created 1530 cuts of which 0 were active
after adding rounds of cuts (33.287 seconds)<br>ZeroHalf was tried 108 times and created 27 cuts of which 0 were active
after adding rounds of cuts (67.834 seconds)<br><br>Result - Optimal solution found (within gap tolerance)<br><br>Objective value: 181.00000000<br>Lower bound:
181.000<br>Gap:
0.00<br>Enumerated nodes: 0<br>Total iterations: 1048<br>Time (CPU seconds): 656.08<br>Time (Wallclock seconds): 121.02<br><br>Total time (CPU seconds): 656.23 (Wallclock
seconds): 121.18</span><span style=" font-size:12pt"><br><br><br><br></span><span style=" font-size:10pt;font-family:sans-serif"><br><br>Wrong Optimal Solution:<br><br>$ cbc Problem_25581_0.mps timemode=elapsed -seconds=400 -keepNames=on -threads=8
-dualt=1e-06 -perturb=on -pertvalue=61 -constraint=on -cuts=on -clique=forceon
-zero=forceon -probing=forceonstrong -combine=on -combine2=on -ratiogap=0.001
-multiple=8 -solve<br>Cbc0011I Exiting as integer gap of 49802 less than 1e-10 or 0.1%<br>Cbc0001I Search completed - best objective 1200049979, took 0 iterations
and 0 nodes (67.05 seconds)<br>Cbc0035I Maximum depth 0, 0 variables fixed on reduced cost<br>Cuts at root node changed objective from 1.2e+09 to 1.2e+09<br>Probing was tried 0 times and created 0 cuts of which 0 were active after
adding rounds of cuts (0.000 seconds)<br>Gomory was tried 0 times and created 0 cuts of which 0 were active after
adding rounds of cuts (0.000 seconds)<br>Knapsack was tried 0 times and created 0 cuts of which 0 were active after
adding rounds of cuts (0.000 seconds)<br>Clique was tried 0 times and created 0 cuts of which 0 were active after
adding rounds of cuts (0.000 seconds)<br>MixedIntegerRounding2 was tried 0 times and created 0 cuts of which 0 were
active after adding rounds of cuts (0.000 seconds)<br>FlowCover was tried 0 times and created 0 cuts of which 0 were active after
adding rounds of cuts (0.000 seconds)<br>TwoMirCuts was tried 0 times and created 0 cuts of which 0 were active
after adding rounds of cuts (0.000 seconds)<br>ZeroHalf was tried 0 times and created 0 cuts of which 0 were active after
adding rounds of cuts (0.000 seconds)<br>Cgl0014I Postprocessing changed objective from 1.20005e+09 to 49979 - possible
tolerance issue - try without preprocessing<br><br>Result - Optimal solution found (within gap tolerance)<br><br>Objective value: 1200049979.00000000<br>Lower bound:
1200000177.000<br>Gap:
0.00<br>Enumerated nodes: 0<br>Total iterations: 0<br>Time (CPU seconds): 241.92<br>Time (Wallclock seconds): 72.52<br><br>Total time (CPU seconds): 242.06 (Wallclock
seconds): 72.68</span><span style=" font-size:12pt"><br><br></span><span style=" font-size:10pt;font-family:sans-serif"><br><br>Thanks</span><span style=" font-size:12pt"><br><br><br><br></span><span style=" font-size:10pt;color:#808080;font-family:Arial"><br><br>Mit freundlichen Grüßen / Kind regards</span><span style=" font-size:12pt;color:#ffbf18;font-family:Calibri"><br>________________________________________</span><span style=" font-size:12pt;font-family:Arial"><b><br><br>Pieter Zieschang</b></span><span style=" font-size:7pt;font-family:Arial"><b><br><br>Modis IT Outsourcing GmbH</b><br>Atriumstraße 1, 04315 Leipzig<br><br>Amtsgericht Düsseldorf: HRB 78227<br>Geschäftsführer: Martin Wimmer, Jörg Brinkmann</span><span style=" font-size:12pt;color:blue"><u><br><br></u></span><a href=https://ito.modis.de/ target=_blank><span style=" font-size:10pt;color:blue;font-family:Arial"><u>ito.modis.de</u></span></a><span style=" font-size:12pt"><br><br></span><span style=" font-size:9pt;color:#8f8f8f;font-family:Arial"><br>Diese E-Mail und alle Anhänge sind vertraulich und für den Adressaten bestimmt
und können auch privilegiert oder von der Offenlegung nach geltendem Recht
ausgenommen sein. Wenn Sie nicht der Adressat sind oder diese E-Mail irrtümlicherweise
erhalten haben, benachrichtigen Sie den Absender unverzüglich, löschen
Sie die E-Mail aus Ihrem System und kopieren Sie keine Teile dieser E-Mail
oder deren Anhänge und geben Sie sie nicht weiter.<br><br>This email and any attachments are confidential and intended for the addressee
and may also be privileged or exempt from disclosure under applicable law.
If you are not the addressee, or have received this email in error, please
notify the sender immediately, delete it from your system and do not copy,
or disclose or otherwise act upon any part of this email or its attachments.
</span><span style=" font-size:12pt"><br>_______________________________________________<br>Cbc mailing list</span><span style=" font-size:12pt;color:blue"><u><br></u></span><a href="mailto:Cbc@list.coin-or.org" target=_blank><span style=" font-size:12pt;color:blue"><u>Cbc@list.coin-or.org</u></span></a><span style=" font-size:12pt;color:blue"><u><br></u></span><a href="https://list.coin-or.org/mailman/listinfo/cbc" target=_blank><span style=" font-size:12pt;color:blue"><u>https://list.coin-or.org/mailman/listinfo/cbc</u></span></a><span style=" font-size:12pt"><br><br><br>-- <br>Dr. Ted Ralphs<br>Professor, Industrial and Systems Engineering<br>Lehigh University<br>(610) 628-1280<br>ted 'at' lehigh 'dot' edu</span><span style=" font-size:12pt;color:blue"><u><br></u></span><a href=http://coral.ie.lehigh.edu/~ted target=_blank><span style=" font-size:12pt;color:blue"><u>coral.ie.lehigh.edu/~ted</u></span></a><span style=" font-size:12pt"><br></span><br><span style=" font-size:9pt;color:#8f8f8f;font-family:Arial">Diese
E-Mail und alle Anhänge sind vertraulich und für den Adressaten bestimmt
und können auch privilegiert oder von der Offenlegung nach geltendem Recht
ausgenommen sein. Wenn Sie nicht der Adressat sind oder diese E-Mail irrtümlicherweise
erhalten haben, benachrichtigen Sie den Absender unverzüglich, löschen
Sie die E-Mail aus Ihrem System und kopieren Sie keine Teile dieser E-Mail
oder deren Anhänge und geben Sie sie nicht weiter.<br><br>This email and any attachments are confidential and intended for the addressee
and may also be privileged or exempt from disclosure under applicable law.
If you are not the addressee, or have received this email in error, please
notify the sender immediately, delete it from your system and do not copy,
or disclose or otherwise act upon any part of this email or its attachments.
</span><tt><span style=" font-size:10pt">_______________________________________________<br>Cbc mailing list<br>Cbc@list.coin-or.org<br></span></tt><a href="https://list.coin-or.org/mailman/listinfo/cbc"><tt><span style=" font-size:10pt">https://list.coin-or.org/mailman/listinfo/cbc</span></tt></a><tt><span style=" font-size:10pt"><br></span></tt><br><br><font face="sans-serif"><div style="color:#968080; font-size: 12px;font-family:Arial">
Diese E-Mail und alle Anhänge sind vertraulich und für den Adressaten bestimmt und können auch privilegiert oder von der Offenlegung nach geltendem Recht ausgenommen sein. Wenn Sie nicht der Adressat sind oder diese E-Mail irrtümlicherweise erhalten haben, benachrichtigen Sie den Absender unverzüglich, löschen Sie die E-Mail aus Ihrem System und kopieren Sie keine Teile dieser E-Mail oder deren Anhänge und geben Sie sie nicht weiter.<br> <br>
This email and any attachments are confidential and intended for the addressee and may also be privileged or exempt from disclosure under applicable law. If you are not the addressee, or have received this email in error, please notify the sender immediately, delete it from your system and do not copy, or disclose or otherwise act upon any part of this email or its attachments.
</div>
</font>