[Fwd: GLPK Dualprices]

[Andrew Makhorin]

-------- Forwarded Message --------
From: Harald Mumm <harald.mumm@hs-wismar.de>
To: mao@gnu.org
Subject: GLPK Dualprices
Date: Sun, 29 May 2022 08:39:28 +0200

> Hallo Andrew,
> 
> is it possible, that GLPK sometimes calculates wrong dual prices?
> 
> I send you an example  in the attachment,  where CPLEX calculates
> 
> other dual prices than GLPK.
> 
> Sincerely yours
> 
> Harald, University of Applied Sciences, Wismar  Germany
> 
> 
> PS CPLEX Dualprices:
> 
> Dual simplex - Optimal:  Objective =  3.5277600000e+03
> Solution time =    0.02 sec.  Iterations = 0 (0)
> Deterministic time = 0.02 ticks  (1.47 ticks/sec)
> 
> CPLEX> display solution dual *
> Constraint Name             Dual Price
> c1                          141.550000
> c2                          330.530000
> c3                          318.280000
> c5                          201.940000
> c7                          237.010000
> c8                          283.710000
> c9                          143.440000
> c10                         221.820000
> c11                         130.990000
> c12                         210.350000
> c13                         205.530000
> c14                         175.150000
> c15                         231.340000
> c17                         155.250000
> c21                         192.060000
> c25                         204.170000
> c41                         144.640000
> All other dual prices matching '*' are 0.
> 
> PS GLPK Dualprices
> 
> c1 = 0.0
> c2 = 0.0
> c3 = 0.0
> c4 = 0.0
> c5 = 0.0
> c6 = 0.0
> c7 = 0.0
> c8 = 0.0
> c9 = 0.0
> c10 = 0.0
> c11 = 0.0
> c12 = 0.0
> c13 = 0.0
> c14 = 0.0
> c15 = 0.0
> c16 = 0.0
> c17 = 0.0
> c18 = 0.0
> c19 = 0.0
> c20 = 0.0
> c21 = 0.0
> c22 = 0.0
> c23 = 0.0
> c24 = 0.0
> c25 = 0.0
> c26 = 0.0
> c27 = 0.0
> c28 = 0.0
> c29 = 0.0
> c30 = 0.0
> c31 = 0.0
> c32 = 0.0
> c33 = 0.0
> c34 = 0.0
> c35 = 0.0
> c36 = 0.0
> c37 = 0.0
> c38 = 0.0
> c39 = 0.0
> c40 = 0.0
> c41 = 0.0
> c42 = 0.0
> c43 = 0.0
> c44 = 0.0
> c45 = 0.0
> c46 = 330.53
>

masterg.lp
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