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Published 20 hours ago • verified publisher icon coin-or

[TRAC] Incorrect solution to quadratic programme

Open qtothec opened this issue 6 years ago • 1 comments

Moved from TRAC as part of COIN fORgery: https://projects.coin-or.org/Clp/ticket/23

The attached MPS file contains a small problem that has the ability to confuse CLP, whereas I would expect the solution to be around 1.713e15 I have observed values in the range of 2.484e15 without presolve and 5.076e15 with. Barrier will yield results of the order of 1023.

qtothec avatar Oct 16 '18 21:10 qtothec

Attachment: MPS file describing the programme https://projects.coin-or.org/Clp/attachment/ticket/23/degenerate.mps Comments: Might also add that the objective is positive semidefinite

Owner changed from somebody to forrest
Status changed from new to assigned

Matrix should only have one copy of off diagonal elements. Still gives problems but I can get 1.71323e15

bernalde avatar Oct 16 '18 22:10 bernalde