XSLP_VSOLINDEX

The vertex solution index (VSOLINDEX) is a measure of how nearly the converged solution to a problem is at a vertex (that is, at the intersection of a set of constraints) of the feasible region.

Where the solution is in the middle of a face, the solution will in general have been achieved through the use of step bounds. The VSOLINDEX is the fraction of delta vectors which are not at a bound in the solution. Therefore, a value of 1.0 means that no delta is at a step bound and therefore the solution is at a vertex of the feasible region. Smaller values indicate that there are deltas at step bounds and so the solution is further from being a vertex solution.