[Scip] LAPACK support and quadratic problems

[Vincent Devillierse]

Hi,

Thanks a lot for the patch, it works perfectly well !
(sorry for the confusion about ipopt and clp)

Vincent


2013/7/8 Stefan Vigerske <stefan at math.hu-berlin.de>

> Hi,
>
> there is currently no easy option in the Makefiles to enable the use of
> LAPACK libraries without linking against Ipopt, mainly because guessing the
> right fortran naming convention is not so trivial (I believe).
> Further, it's usually a good idea to build with Ipopt when solving
> nonlinear problems with SCIP, anyway.
>
> Anyhow, attached is a patch for cons_quadratic.c that uses Lapack directly
> without the detour of the Ipopt/Lapack C-interface.
> You will have to compile with USRLDFLAGS="-llapack -lblas" and maybe also
> have to adjust the F77_FUNC define in the patch to work with your Fortran
> compiler.
>
> Stefan
>
> PS: Clp and Ipopt are two very different things.
>
>
> On 07/08/2013 12:15 PM, Vincent Devillierse wrote:
>
>> Dear SCIP community,
>>
>> I've tried to solve a non integer quadratic problem with SCIP, but the
>> computing time was very slow.
>> Apparently I need to either link against CLP (to benefit from the Interior
>> Point solver Ipopt) or compile SCIP with LAPACK support.
>>
>> I'd like to go with the second possibility. In the INSTALL file I read
>> this
>> :
>> "If this file is not present in your Clp version, SCIP tries to guess the
>> paths and libraries: it assumes that Blas and Lapack are installed as
>> system libraries (libblas.a, liblapack.a) and are not build into the
>> CoinUtils library."
>>
>> This is my case (Blas and Lapack are installed as system libraries) but
>> when I use SCIP I keep getting the message "Quadratic constraint handler
>> does not have LAPACK for eigenvalue computation." and low performance.
>>
>> What am I missing and what should I do ?
>>
>> Thanks in advance for any help you are able to provide !
>>
>> Best regards,
>>
>> Vincent
>>
>>
>>
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>
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