CPXXqpopt and CPXqpopt

Description

The routineCPXXqpopt/CPXqpopt may be used, at any time after a continuous quadratic program has been created, to find a solution to that problem using one of the CPLEX quadratic optimizers. It consults the parameter that controls the choice of optimizer (Dual Simplex, Primal Simplex, or Barrier) for the algorithm for continuous quadratic optimization (CPXPARAM_QPMethod). With the default setting of this parameter (that is, Automatic) CPLEX invokes the barrier method because it is fastest on a wide range of problems.

Arguments

env

A pointer to the CPLEX environment as returned by CPXXopenCPLEX/CPXopenCPLEX.

lp

A pointer to the CPLEX problem object as returned by CPXXcreateprob/CPXcreateprob.

Return

The routine returns zero unless an error occurred during the optimization. Examples of errors include exhausting available memory (CPXERR_NO_MEMORY) or encountering invalid data in the CPLEX problem object (CPXERR_NO_PROBLEM). Exceeding a user-specified CPLEX limit, or proving the model infeasible or unbounded are not considered errors. Note that a zero return value does not necessarily mean that a solution exists. Use the query routines CPXXsolninfo/CPXsolninfo, CPXXgetstat/CPXgetstat, and CPXXsolution/CPXsolution to obtain further information about the status of the optimization.

Example

 status = CPXqpopt (env, lp);