-------- Forwarded Message -------- From: Dominik Hollmann <[email protected]> To: [email protected] <[email protected]> Subject: Bug with objective value Date: Tue, 27 Oct 2015 09:25:43 +0000
Hi, I might have found a bug when displaying the objective value after solving a problem. I am using GLPK 4.56 compiled as w64 command line application and solving the attached model using the command „glpsol –m test.mod –o test.sol“ In the mod-file there is a display command at line 179 „display OOBJ_MDemSho;“ which gives -1481981.40399653. However, this is not the correct objective value – which would be -3.565219231e-010 (or 0). In line 180, there is a display command with the term of the objective, which gives the correct result. Also, in the sol-file you see both values: In line 6 it says “Objective: OOBJ_MDemSho = -3.565219231e-010 (MINimum)” and in line 10 it states “ 1 OOBJ_MDemSho B -1.48198e+006 “ One possible explanation might be, that primal and dual value of the objective are mixed up. However, GLPK gives the same result with both simplex algorithms as well as the interior point algorithm. Could you have a look into this matter? Kind regards Dominik Hollmann ________________________________________ Dr. Dominik Hollmann Senior Consultant ORCONOMY GmbH Technologiepark 19 33100 Paderborn Telefon +49 5251 68220-25 Mobil +49151 65119039 Fax +49 5251 68220-925 [email protected] www.orconomy.de ________________________________________ ORCONOMY GmbH, Paderborn - HRB 9404, Amtsgericht Paderborn - Geschäftsführer: Dr. Stefan Bunte, Dr. Jens Peter Kempkes, Dr. Ingmar Steinzen
test.mod
Description: test.mod
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