Unbounded ray not found when there are no constraint

[svigerske]

Issue created by migration from Trac.

Original creator: blegat

Original creation time: 2017-06-01 10:28:47

Assignee: somebody

Version:

Dear Clp maintainers,

For the trivial problem (see attachment for an mps):

Minimize x0 + x1 Subject To

Bounds

x1 >= 0
x1 free

End

Clp correctly detects it to be unbounded but returns NULL when asked for the Unbounded ray (see here).

While it may look silly to ask Clp to solve such a trivial problem, this actually happens as part of a larger algorithms (see here) so it wasn't generated by hand and the fact that Clp fails on such simple problems makes it unusable for the whole algorithm :(

[svigerske]

Attachment ticket82.mps by blegat created at 2017-06-01 10:29:31

Trivial unbounded problem for which the unbounded ray is not found

[svigerske]

Fixed by @jjhforrest in 832b459.