Hello all Calling 'glp_scale_prob' on a tiny MIP problem results in the following terminal output:
<output> Scaling... A: min|aij| = 1.000e+00 max|aij| = 8.000e+05 ratio = 8.000e+05 GM: min|aij| = 5.494e-01 max|aij| = 1.820e+00 ratio = 3.312e+00 EQ: min|aij| = 3.096e-01 max|aij| = 1.000e+00 ratio = 3.230e+00 </output> I would like to describe this output (or a similar example) on the GLPK wikibook page: http://en.wikibooks.org/wiki/GLPK/Terminal_output However I didn't see the output format explained in much detail in the GLPK API manual. So my first cut is as follows: <wikibook> where: A indicates the original constraint matrix, A = (a_ij) GM indicates geometric mean scaling EQ indicates equilibration scaling 2N indicates round scale factors to nearest power of two SKIP indicates skip scaling if the problem is well scaled In the above example, GM and EQ scaling have been applied in that order. The min and max indicate ... and the ratio is determined by simple division. Scaling is on by default under GLPSOL, but can be disabled using the <tt>--noscale</tt> option. </wikibook> Can anybody add/correct/comment on this text please. many thanks Robbie --- Robbie Morrison PhD student -- policy-oriented energy system simulation Technical University of Berlin (TU-Berlin), Germany University email (redirected) : [email protected] Webmail (preferred) : [email protected] [from Webmail client] _______________________________________________ Help-glpk mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-glpk
