[Cbc] CoinModel Equality?

[Matthew Gidden]

Awesome, thank you, John.


On Thu, Feb 13, 2014 at 11:43 AM, John Forrest
<john.forrest at fastercoin.com>wrote:

>  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>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> 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
>>>
>>>  _______________________________________________
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>>> Cbc at list.coin-or.org
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>>>
>>>
>>
>
>
>  --
> Matthew Gidden
> Ph.D. Candidate, Nuclear Engineering
> The University of Wisconsin -- Madison
> Ph. 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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