Re: [ojAlgo-user] QP with ExpressionsBasedModel, factor 1/2

[Stefan K. <st...@gm...>]

Hello Andres,

thank you for your fast reply. If I do not need to consider the 
documentation of QuadraticSolver/ConvexSolver, everything works fine and 
I have no further questions.

Thank you
Stefan

Am 16.02.2015 um 13:34 schrieb Anders Peterson:
> You do not need to consider the documentation of any specific solver when using ExpressionsBasedModel (but you do need to remember that currently/still no solver can handle quadratic constraints).
>
> ExpressionsBasedModel.minimise() will minimise whatever model you built. What did you build and how was anything disregarded?
>
> The entire org/ojalgo/optimisation/quadratic package has been replaced by org/ojalgo/optimisation/convex. Most likely the site and docs still need some updates to reflect that change. As a user of ExpressionsBasedModel you do not need to worry about that
>   
>
> /Anders
>
>
>
>> On 16 feb 2015, at 08:07, Stefan Kiesel <st...@gm...> wrote:
>>
>> Hello,
>>
>> I'm trying to solve a quadratic optimisation problem. The qp-link below Main ingredients at ojalgo.org leads to http://ojalgo.org/generated/org/ojalgo/optimisation/quadratic/QuadraticSolver.html . This documentation says, that ojalgo solves qps of the form
>>
>> min 1/2 x^T Q x - c^T x
>>
>> I've created an ExpressionsBasedModel and solved it by calling ExpressionsBasedModel.minimise(). The solution seems to be correct but the factor 1/2 is ignored. Does ExpressionsBasedModel.minimise() minimise qps of the form
>>
>> min x^T Q x - c^T x
>>
>> or did I missunderstand something?
>>
>> Thanks
>> Stefan
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