[Cbc] CoinModel Equality?

[John Forrest]

Matthew,

There is a CoinModel::differentModel which should do what you want.  
There is a default tolerance test for two values being same - if this 
isn't good enough then it would be easy to pass in a tolerance test to 
one of the CoinModels.

John Forrest
On 06/02/14 19:42, Matthew Gidden wrote:
> Great, thanks for your response, Miles!
>
>
> On Thu, Feb 6, 2014 at 12:27 PM, Miles Lubin <miles.lubin at gmail.com 
> <mailto:miles.lubin at gmail.com>> wrote:
>
>     Hi Matthew,
>
>     CoinModel can be used to store an LP/MIP instance, but I don't
>     believe there are any comparison methods. You'll likely have to
>     manually iterate through the problem data to compare entry by
>     entry, using whatever floating-point comparison tolerance is
>     appropriate. I would also suggest building your infrastructure
>     around a solver-independent interface like OSI, because it's
>     always valuable to be able to compare the performance of different
>     solvers. Any academic publication would be remiss to only use one
>     open-source MIP solver when making claims about time to solve a
>     particular problem.
>
>     Best,
>     Miles
>
>
>     On Thu, Feb 6, 2014 at 12:51 PM, Matthew Gidden <gidden at wisc.edu
>     <mailto:gidden at wisc.edu>> wrote:
>
>         Hi all,
>
>         First time caller, long time listener. I'm gearing up the
>         portion of my research in which I'll be using and comparing
>         simplex and branch-and-cut solvers versus some naive solvers
>         in our simulation environment [1]. We require a permissive,
>         open source license (for compatibility with our own - BSD
>         3-clause), so the COIN suite was a natural fit.
>
>         To the meat of my question:
>         I've written a high-level API for myself and other devs to use
>         to describe an problem instance in part of our simulation
>         framework. I would like to be able to unit test it such that a
>         problem instance it describes is equivalent to some known
>         problem instance (read in through MPS, for example). My
>         initial thought was to compare configured CoinModels (i.e.,
>         builders). Is there an easy way to compare them? Is this the
>         best approach?
>
>         I look forward to your response, thanks!
>
>         [1] http://fuelcycle.org/
>
>         -- 
>         Matthew Gidden
>         Ph.D. Candidate, Nuclear Engineering
>         The University of Wisconsin -- Madison
>         Ph. 225.892.3192 <tel:225.892.3192>
>
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>
>
>
>
>
> -- 
> Matthew Gidden
> Ph.D. Candidate, Nuclear Engineering
> The University of Wisconsin -- Madison
> Ph. 225.892.3192
>
>
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