[Coin-symphony] Sensitivity Analysis

[Menal Guzelsoy]

Dave,

The usage of those variables does not depend on the status of the node. I have
just modified that function with a fix to those lines. It seems to be working
now.

We are planning to get to the function 'get_lb_for_new_obj' soon, however
you are always welcome to contribute to the project if you feel to 
implement it
before we do.

Menal.

Quoting David Goodlad <dgoodlad at gmail.com>:

> Hi again
>
> I've been playing with the sym_get_ub_for_new_obj function, and have
> found that it's not working properly.  It segfaults when building the
> new objective value...
>
> Anyway, from some analysis, it seems that the function
> get_ub_for_new_obj is very broken.  I'm working on fixing it (I'll
> supply a patch once I get it going), but have one question.  The
> sol/sol_ind/sol_cnt variables, making up the solution in the bc_node
> struct, seem to store the values/indices of the non-zero variables in
> the solution.  However, there are spots in the current function that
> refer to it in a different way (see lines 3044-3045 compared to lines
> 3055-3056 in master_func.c).  Does the usage of these variables change
> depending on feasibility status of the node?  I wouldn't expect it to,
> but I only started looking at Symphony last weekend, so can't be sure!
>
> Also, is there a planned (or just uncommitted) version of
> get_lb_for_new_obj?  Otherwise, I am going to look into implementing
> that as well.
>
> Thanks
> Dave
>
> On 2/7/06, David Goodlad <dgoodlad at gmail.com> wrote:
>> Hi Menal,
>>
>> Thanks for the quick answer.  It compiles fine now.
>>
>> Dave
>>
>> On 2/7/06, Menal Guzelsoy <megb at lehigh.edu> wrote:
>> >
>> > David,
>> >
>> > That function is not complete yet and needed to be commented out. 
>> Just do an
>> > update now.
>> >
>> > Menal.
>> >
>> > Quoting David Goodlad <dgoodlad at gmail.com>:
>> >
>> > > Hi all
>> > >
>> > > It seems that when building Symphony with SENSITIVITY_ANALYSIS enabled
>> > > in the config, I end up with a library missing a function definition.
>> > > get_lb_for_new_obj is declared in the master.h file but looking into
>> > > master_func.c where similar functions are defined shows that it's just
>> > > 'missing'.  Is this functionality just incomplete for now, or am I
>> > > missing something here?
>> > >
>> > > This is with the latest from CVS, by the way.
>> > >
>> > > Thanks!
>> > > Dave
>> > >
>> > > --
>> > > Dave Goodlad
>> > > dgoodlad at gmail.com or dave at goodlad.ca
>> > > http://david.goodlad.ca/
>> > >
>> > > _______________________________________________
>> > > Coin-symphony mailing list
>> > > Coin-symphony at list.coin-or.org
>> > > http://list.coin-or.org/mailman/listinfo/coin-symphony
>> > >
>> >
>> >
>> >
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>>
>>
>> --
>> Dave Goodlad
>> dgoodlad at gmail.com or dave at goodlad.ca
>> http://david.goodlad.ca/
>>
>
>
> --
> Dave Goodlad
> dgoodlad at gmail.com or dave at goodlad.ca
> http://david.goodlad.ca/
>



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