Getting lists of solutions
Apart from just getting an attribute value for a given solution and problem (using the functions XPRS_msp_getintattribprobsol and XPRS_msp_getdblattribprobsol) the user may also be interested in how an attribute behaves over a set of solutions. For example, the user may want the objective function values for the solutions with respect to a given problem. Another example may be that the user wants the MIP infeasibilities of the solutions with respect to a given problem.
The function XPRS_msp_getsollist is used to query for a list of solutions based on an attribute. The solutions are returned as a list of solution IDs. The user can choose to rank the returned solutions by their attribute values and they may also choose to return solutions in a range of the ranked ordering of the solutions. The user can, for example, get the objective functions of the solutions ranked in ascending order so they can find the one (or more) solutions that have the minimum objective value.
Note that XPRS_msp_getsollist will only return solutions for which the attribute is relevant. For example, if the user queries on the objective function values then only feasible solutions of the problem are returned. If, for example, the users queries on MIP infeasibilities then only those solutions with any MIP infeasibilities are returned.
A function XPRS_msp_getsollist2, similar to XPRS_msp_getsollist, provides the user with additional filtering control on the returned list of solution IDs.
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