> > Thanks, quickly looked at the > reference manual and it looks really > > good. The sensitivity report preamble message has been > turned off, > > which is nice. But I'm not sure what would happen if > you give > > glp_analyze_coef a none-basic variable? > > This is a trivial case which needs no analysis. For > example, if > non-basic variable x have its lower bound active and its > reduced > cost, say, 1.23, you cannot decrease the objective > coefficient more > than on 1.23; otherwise the reduced cost becomes negative > and the > basis becomes dual infeasible (non-optimal). > > > Similarly, what would happen > > if you give glp_analyze_bound a basic variable? > > This is also a trivial case, even easier than the previous > one. > For example, if primal value of basic variable x is 3.21, > its lower > bound cannot be greater and its upper bound cannot be less > than 3.21; > otherwise the basis becomes primal infeasible.
Sure, both cases are trivial, I am only not sure what the call would result? Would there be some bad consequences of you call that way? > > > The reference manual > > does not mention this, it seems to me. BTW, I'm not > sure how to check > > if a variable is basic or not, simply checking if the > value is at one > > of its bounds is easy but not a reliable way to do > this. > > glp_get_row_stat/glp_get_col_stat should be used. > Thanks for that one. :) Yingjie _______________________________________________ Help-glpk mailing list Help-glpk@gnu.org http://lists.gnu.org/mailman/listinfo/help-glpk