[Clp] manual pivoting

[Kibaek Kim]

Hi everyone,

I am using Clp to manually perform pivots. For a given vertex, I am checking
every adjacent vertices based on the basis information.

To do that, my solver calls OsiClpSolverInterface::primalPivotResult( ... ).
But the solver sometimes gives an error. The error occurs in
ClpSimplexPrimal.cpp line 2927, which indicates CoinAssert (fabs(alpha_) >
1.0e-8).

I guess the error occurs when pivoting step size is too small. Is that
right? If so, is there any way to properly handle this?

Thanks in advance,

Kibaek
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