[Coin-lpsolver] enableSimplexInterface

[Matthew Galati]

Hi CLP,

Not sure if this is a bug or if I am using it incorrectly. I want access 
to basis information. To "enable" the simplex interface, I do the following:

si->getModelPtr()->setSolveType(1);
si->enableSimplexInterface(false);

After solving (using dual simplex), I call

const double * sol = si->getColSolution();

to get the primal solution - however, it seems to return all zeros.

If you do not enable the simplex interface it correctly returns the 
optimal solution.

I have attached a small example which shows this.




Another question, using OsiClp, what is the best way to access the 
values of the basic variables from the simplex interface? In CPX, there 
is a function

CPXgetbhead (getEnvironmentPtr(),
			 getLpPtr( OsiCpxSolverInterface::KEEPCACHED_ALL ), 
			 head, y);

that returns the indices of the basic variables 'head' (OsiClp currently provides the access method getBasics) and their values 'y' (which I don't currently see an access method in OsiClp).


Thanks,
Matt

-- 
Matthew Galati
ISE Lehigh University
IBM Service Parts Solutions
610.758.4042 (Office)
610.882.0779 (Home)
magh at lehigh.edu, magal11 at us.ibm.com
http://sagan.ie.lehigh.edu/mgalati/

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