[Dip] generateCuts Question

[Kipp Martin]

Hi:

The class DecompApp has a virtual function


virtual int generateCuts(const double  * x,
      DecompCutList & newCuts);


I have implemented this function in a class that derives from DecompApp. 
  When solving an integer program that has an integer LP relaxation 
value, generateCuts() does not get called. This seems like a potential 
problem for routing problems where I might want  generateCuts() to 
generate subtour elimination constraints. It is possible to have an 
integer solution and a subtour so I want generateCuts called even with 
an integer solution.

Indeed, in the sample code, TSP_DecompApp.cpp I see the implementation 
of generateCuts() calls in turn generateCutsSubtour(). But will 
generateCuts() get called if there is an integer solution? It seems like 
it should, yet I have an example where generateCuts() is not being 
called when the LP is integer.

Thanks


-- 
Kipp Martin
Professor of Operations Research
and Computing Technology
Booth School of Business
University of Chicago
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