[Fwd: Potential Bug Inquiry of GLPK]

[Andrew Makhorin]

-------- Forwarded Message --------

Date: Fri, 28 Mar 2025 05:47:46 +0000

Subject: Potential Bug Inquiry of GLPK

To: bug-glpk@gnu.org <bug-glpk@gnu.org>

From: Xintong Zhou <xintong.zhou1@uwaterloo.ca>

Hi,

 

For the attached MIP instance, glpk returns inconsistent solution from other solvers (gurobi, scip, cbc, etc.):

 

Solver: glpk

Status: optimal

Objective: 719.9720119999995

Solution: x0 = -16.0227, x1 = -21, x10 = -12.8843, x11 = 12.7869, x12 = 8.14194, x13 = 2, x14 = 8, x2 = 13, x3 = 15.4538, x4 = -17.7989, x5 = 12, x6 = 13, x7 = -13.2403, x8 = -15.3864, x9 = 0

 

Other solvers: gurobi, scip, cbc

Status: optimal

Objective: 753.7582332008659

x0 = -15.463687107327548, x1 = -21, x10 = -12.199926653390905, x11 = 14.21831006806401, x12 = 8.405692364355126, x13 = 3, x14 = 8, x2 = 13, x3 = 14.914090946681345, x4 = -17.47869218574566, x5 = 12, x6 = 13, x7 = -13.025528967164595, x8 = -15.385886605757548, x9 = 0

 

Is this result expected? Any response is appreciated.

Thanks for your time.

 

Best,

Xintong Zhou

sees.mps
Description: sees.mps