[Osi] How to change solve algorithm to Dual or Barrier with OsiClpSolverInterface ?

[Matthew Galati]

What function are you using to solve? 

Send the code snippet that sets the parameters and solves. 

Sent from my iPhone

On Sep 8, 2011, at 5:00 AM, Sylvain R <ross_dev at hotmail.com> wrote:

> Hello,
> 
> I have been trying for quite a while to modify the algorithm that Clp uses to solve rather big linear problem. Clp says it is using Primal according to the solve-message I get (e.g. Clp0006I 6112  Obj 799905 Primal inf 50170.4 (1044)). 
> 
> But I would like to try to solve with the Dual method, and even the Barrier method. With CPLEX I have been able to do that and it considerably improved the run time (by x2 and x3).
> 
> I have been trying different ways:
> 
> 1) call setIntParam with OsiDoDualInInitial to true.
> 2) call setSolveOptions(const ClpSolve & options) with the proper ClpSolve object with method set to Dual or Barrier.
> 
> But it does not seem to change anything, it still goes at the same speed, nor does it display messages indicating it is doing anything differently.
> 
> 
> Any idea? is it possible altogether?
> 
> 
> Sylvain
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