411 REFERENCE · Wikibooks
GLPK/Callback functions
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
This page describes the utilization of callback functions.
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Lazy constraints
The callback function is called with GLP_IROWGEN when the current relaxed subproblem has been solved to optimality.
Now lazy constraints can be added using library functions glp_add_rows,glp_set_row_name, glp_set_row_bnds, and glp_set_mat_row.
As of GLPK 4.60 the following bug exists:
An optimal solution may be found by the rounding heuristic which does not result in a callback with GLP_IROWGEN.
As a workaround set iocp->sr_round = GLP_OFF to switch of the rounding heuristic.