|From:||Kelly, Jeff (ON0F)|
|Subject:||[Help-glpk] Modifying the column statuses to make a valid LP basis after some column bounds have been modified.|
|Date:||Mon, 2 May 2011 06:31:31 -0400|
After I solve either a primal or dual simplex LP successively I then use glp_get_col_stat() to recover the statuses. Then based on the solution values I modify some of the variables by using glp_set_col_bnds() with either GLP_DB or GLB_FX attributes.
When I try to re-solve by first calling glp_set_col_stat() and glp_set_row_stat() the return from glp_simplex() (i.e., glp_warm_up() called internally) is usually that the LP basis is invalid.
Therefore I am wondering how I can modify the statuses apriori given the new column bounds if that is even possible?
Thanks - Jeff
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