CPLEX cpxcb DUAL

This page is part of the CPLEX Manual. See CPLEX.

CPLEX Dual simplex callback.

Called from TOMLAB /CPLEX when solving linear problems using the dual simplex algorithm.

This callback is enabled by setting callback(2) = 1 in the call to cplex.m, or P rob.M I P.callback(2) = 1 if using tomRun('cplex',...).

cpxcb DUAL is called with one argument, the cpxCBInfo progress information vector. Contents of cpxCBInfo vector:

i cpxCBInfo(i)	    - Value
-------------------------------------------------------------
 1 PRIMAL_OBJ       - primal objective value
 2 DUAL_OBJ dual    - objective  value
 3 RIMAL_INFMEAS    - measure of  primal infeasibility
 4 DUAL_INFMEAS	    - measure of  dual  infeasibility
 5 PRIMAL_FEAS	    - 1 if primal feasible,  0 if not
 6 DUAL_FEAS	    - 1 if dual  feasible, 0 if not
 7 ITCOUNT	    - iteration count
 8 CROSSOVER_PPUSH  - primal push crossover itn. count
 9 CROSSOVER_PEXCH  - primal exchange crossover itn. count
10 CROSSOVER_DPUSH  - dual  push crossover itn. count
11 CROSSOVER_DEXCH  - dual  exchange crossover itn. count

By returning a nonzero value from cpxcb DUAL, the user can terminate the optimization.

If modifying this file, it is recommended to make a copy of it which is placed before the original file in the MATLAB path.