[Coin-discuss] adding constraints incrementally to OsiSolverInterface

[Kish Shen]

Hi,

On Wednesday 12 July 2006 17:51, J P Fasano wrote:
> > One thing about the CoinPackedMatrix: the
> > documentation states that `extra'
> > spaces can be added to the matrix to
> > allow for faster insertion of new data.
> > Perhaps this can be exposed to the user
> > in both Clp's and Osi(Clp)SolverInterface's
> > loadProblem() methods?
>
> You could use the loadProblem method that has
> CoinPackedMatrix as an input parameter:
>
>    virtual void loadProblem (const CoinPackedMatrix &matrix,
>                              const double *collb, const double *colub,
>                              const double *obj,
>                              const double *rowlb, const double *rowub);
>
> see:
> http://www.coin-or.org/Doxygen/Osi/class_osi_solver_interface.html#z124_0
>
>
Thanks for your reply. Loading in the problem using a CoinPackedMatrix (with 
extraGap and extraMajor of 1.3) does not seem to make any difference to the 
performance. Looking at the code in ClpModel.cpp, I think the problem in the 
CoinPackedMatrix is copied to the internal Clp representation, and the 
extraGap and extraMajor information in the CoinPackedMatrix is not copied 
into this internal representation (which seems to be of class ClpPackedMatrix 
rather than CoinPackedMatrix).

Cheers,

Kish

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