On Wed, 2013-03-06 at 14:23 -0600, David T. Price wrote: > The test for dual infeasibility is wrong. > It does not have a test for > rows or columns of type GLP_DB (at least when lb < ub). See glpapi12.c, > lines 720-740. > >
I don't think so. In glpk dual variables (i.e. reduced costs) for double-bounded primal variables are combined Lagrange multipliers, which may have any sign in the dual feasible solution (like for fixed primal variables), so such dual variables need not to be tested. For details please see Section 4.1 "Background", in particular, the table on p.118, in the glpk reference manual. Andrew Makhorin _______________________________________________ Bug-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/bug-glpk
