[Scip] Unbounded LP Relaxation

[Stephen J Maher]

Hi All,

I am using SCIP to implement Benders decomposition. I am having some 
difficulty with some of the subproblems in that the LP relaxation 
becomes unbounded in some iterations of the program. When I run my 
program in debug mode I get the error

[src/scip/lpi_spx.cpp:3100] ERROR: SCIPlpiGetPrimalRay() not supported 
by SoPlex

What I was wondering is whether it is possible to identify at some stage 
in the SCIP solving process whether the LP is unbounded, and to stop the 
solving?

I am solving the subproblems with column generation so I have tried 
using the functions

SCIPlpiIsPrimalUnbounded and SCIPlpiIsDualUnbounded

however they both return false and then the error occurs.

Thanks a lot for your help,

Steve
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