[Coin-lpsolver] getBInvRow() question

[John J Forrest]

Gleb,

You can see an example of using OsiClpSolverInterface and scaling (for 
getBInvARow/Col) and just looking at nonzeroes of result at about line 
1378 of Osi/test/OsiClpSolverInterfaceTest.cpp.

However you wish to use getBInvRow not getBInvARow and want to use it from 
Clp itself.  I gather you have got it to work with scaling switched off? 
Looking at code in ClpSimplex.cpp it looks as if that is older code than 
in OsiClpSolverInterface and does not deal with scaling unlike ARow and 
ACol.

If you want I can update code in ClpSimplex.cpp to handle scaling - do you 
want me to?  May not be before Monday - send me a note if I don't post 
anything by Tuesday.

John Forrest



Gleb Belov <gleb.belov at tu-dresden.de> 
Sent by: coin-lpsolver-bounces at list.coin-or.org
09/05/2007 10:57 AM

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[Coin-lpsolver] getBInvRow() question






Hi,

I am new to CLP. I want to use it without OSI to save compilation time.
My problem concerns getBInvRow(). It returns just rows of the identity 
matrix.
I solved my model by calling ClpSimplex::primal(0,7).

I looked at OsiClpSolverInterface::enableSimplexInterface(bool). As I 
understand, it disables scaling. Is it necessary for getBInvRow() to work?

Sincerely,
Gleb

-- 
Mit freundlichen Gruessen

G. Belov
----------------------------------------------------------------------
Dr. Gleb Belov                                Gleb.Belov at tu-dresden.de
Wiss. Assistent                   http://www.math.tu-dresden.de/~belov
Technische Universitaet Dresden                 Tel: +49 351 463 34186
Institut fuer Numerische Mathematik             Fax: +49 351 463 34268
Mommsenstr. 13                            Tel. priv.:+49 351 3743754
01062 Dresden

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