[Bug-glpk] [Fwd: Sensitivity analysis problem]

[Andrew Makhorin]

-------- Forwarded Message --------
From: Adam Kucharski <address@hidden>
To: address@hidden <address@hidden>
Subject: Sensitivity analysis problem
Date: Sun, 22 Sep 2019 16:33:54 +0000

> Hello,
> 
> something is wrong with sensitivity analysis. Some activity ranges
> are miscalculated. Check the attached files. The first interval for
> "constr1" in prob1.lp should be <450, Inf) but in the sensitivity
> report is <350, 450>. This is quite interesting because the right
> hand side of this constraint is 500. I even calculated this range
> manually using simplex. 
> 
> For the first constraint in the second model (prob2.lp), the first
> interval is also different than it should be that is (-Inf, 102000>.
> 
> I have used the glpkAPI packge for R.
> 
> Best regards
> Adam Kucharski

prob1.lp
Description: prob1.lp

prob2.lp
Description: prob2.lp