commit 9734f4815fda152a20491a617818badb631adbf6
Author: Chris Matrakidis <address@hidden>
Date:   Sat Jan 14 16:24:45 2017 +0200

    use schur complement update in pcost calculation

diff --git a/src/glpios09.c b/src/glpios09.c
index 727761c..255e681 100644
--- a/src/glpios09.c
+++ b/src/glpios09.c
@@ -447,12 +447,19 @@ static double eval_degrad(glp_tree *T, int j, double bnd)
       double degrad;
       /* prepare lp */
       if (lp == NULL)
-      {  /* the current basis must be optimal */
+      {  glp_bfcp bfcp;
+         /* the current basis must be optimal */
          xassert(glp_get_status(P) == GLP_OPT);
          /* create a copy of mip */
          lp = glp_create_prob();
          glp_copy_prob(lp, P, 0);
          csa->work = lp;
+         glp_get_bfcp(lp, &bfcp);
+         if (bfcp.type & GLP_BF_FT)
+         {  bfcp.type &= ~GLP_BF_FT;
+            bfcp.type |= GLP_BF_BG;
+         }
+         glp_set_bfcp(lp, &bfcp);
          /* factorize and store */
          glp_factorize(lp);
          csa->bfd = bfd_create_it();