CPLEX cpxcb FLOWMIR

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

CPLEX Mixed integer rounding cut callback.

Called from TOMLAB /CPLEX during Mixed integer rounding cuts processing.

This callback is enabled by setting callback(11) = 1 in the call to cplex.m, or Prob.MIP.callback(11) = 1 if using tomRun('cplex',...).

cpxcb FLOWMIR is called with one argument, the cpxCBInfo progress information vector.

Contents of cpxCBInfo variable:

i cpxCBInfo(i)	        - Value
-------------------------------------------------------------
 1 BEST_INTEGER	        - obj. value of best integer solution
 2 BEST_REMAINING	- obj. value  of best remaining node
 3 NODE_COUNT	        - total number of nodes solved
 4 NODES_LEFT	        - number of remaining  nodes
 5 MIP_ITERATIONS	- total number of MIP iterations
 6 MIP_FEAS	        - returns 1 if feasible solution exists; otherwise, 0
 7 CUTOFF	        - updated cutoff  value
 8 CLIQUE_COUNT	        - number of clique cuts added
 9 COVER_COUNT	        - number of cover cuts added
10 DISJCUT_COUNT	- number of disjunctive cuts added
11 FLOWCOVER_COUNT	- number of flow cover cuts added
12 FLOWPATH_COUNT	- number of flow path cuts added
13 FRACCUT_COUNT	- number of Gomory fractional cuts added
14 GUBCOVER_COUNT	- number of GUB cover cuts added
15 IMPLBD_COUNT	        - number of implied bound cuts added
16 MIRCUT_COUNT	        - number of mixed integer rounding cuts added
17 PROBE_PHASE	        - current phase of probing (0-3)
18 PROBE_PROGRESS	- fraction of probing  phase completed (0.0-1.0)
19 FRACCUT_PROGRESS     - fraction of Gomory  cut  generation for  the  pass completed (0.0 - 1.0)
20 DISJCUT_PROGRESS     - fraction of disjunctive cut  generation for  the  pass completed (0.0 - 1.0)
21 FLOWMIR_PROGRESS     - fraction of flow cover and MIR cut generation for the pass completed (0.0 - 1.0)
22 MY_THREAD_NUM	- identifier of the parallel thread making this call (always  0)
23 USER_THREADS	        - total number of parallel threads currently running (always  1)

By returning a nonzero value from cpxcb FLOWMIR, 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.