User Tools

Site Tools


gams:i_know_a_better_solution

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

gams:i_know_a_better_solution [2008/10/24 14:56] (current)
support created
Line 1: Line 1:
 +====== I know a better solution ======
  
 +Sometimes users send us a model with the statement: the solver found a solution ''​x''​ with objective value ''​z'',​ but I know a better solution y which has objective value ''​z*''​. The solver can sometimes help checking such a conjecture by fixing the variables to the proposed solution, and see if this causes any infeasibilities:​
 +
 +<​code>​
 +* enter data for proposed solution
 +PARAMETER P(I) proposed solution /
 +    i1 1.0
 +    i2 2.0
 +    i3 3.0 
 +/;
 +
 +* fix variables
 +X.FX(I) = P(I);
 +
 +* and let solver check if this is a feasible solution
 +SOLVE M USING MIP MINIMIZING Z;
 +</​code>​
IMPRESSUM / LEGAL NOTICEPRIVACY POLICY gams/i_know_a_better_solution.txt ยท Last modified: 2008/10/24 14:56 by support