[Dip] SmallIP Example and Implicity Polyhedra

[Matthew Galati]

FYI. I am pushing a change today so that the user does not need to ever call
fixNonActiveColumns. The framework will do this for the user. This will
simplify things a little.


On Sun, Sep 5, 2010 at 10:18 AM, Matthew Galati <Matthew.Galati at sas.com>wrote:

>  To help illustrate -- I will create several variants of the GAP example
> (sparse build, dense build, built-in MILP oracle, user-defined oracle, etc)
> to show the different use cases. I'll let you know when that is done.
>
>
>
> Thanks,
>
> Matt
>
>
>
>
>
> *From:* kippmartin71 at yahoo.com [mailto:kippmartin71 at yahoo.com]
> *Sent:* Saturday, September 04, 2010 2:21 AM
> *To:* Matthew Galati
> *Cc:* dip at list.coin-or.org
> *Subject:* SmallIP Example and Implicity Polyhedra
>
>
>
> Hi:
>
> In the Dip/examples/SmallIP
>
> the use of
>
>    setModelRelax(NULL);
>
> is illustrated, presumably for implicitly defined polyhedra. But in this
> example there is only one block. When using
>
>    setModelRelax(NULL);
>
> Hi:
>
> In the Dip/examples/SmallIP
>
> the use of
>
>    setModelRelax(NULL);
>
> is illustrated, presumably for implicitly defined polyhedra. But in this
> example there is only one block. When using
>
>    setModelRelax(NULL);
>
> how do you specify the block?
>
> I need to solve a problem that is block angular (more than one block) and
> not give an explicit description of the block polyhedra. I am still really
> confused on how to do this. Is the following sufficient?
>
> 1) For each block create a DecompConstraintSet, i.e.
>
> modelRelax = new DecompConstraintSet();
>
>
> 2) For modelRelax in each block specify the columns that define the block
> using
>
> modelRelax->activeColumns.push_back( i)
>
> 3) For each block call the method
>
> modelRelax->fixNonActiveColumns();
>
> 4)  For each block call
>
>
>  setModelRelax(NULL);
>
> But how can this work since the setModelRelax does not know the block name
> or number?  I have studied the examples, but it seems like in every example
> the constraint matrix is specified for the blocks and I don't see an example
> of setModelRelax() with more than one block.  I just cannot figure out what
> the sufficient steps are for this case.
>
> Thanks
>
>
>
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