// @(#)root/quadp:$Name:  $:$Id: TQpLinSolverSparse.cxx,v 1.4 2004/06/09 12:23:16 brun Exp $
// Author: Eddy Offermann   May 2004

/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

/*************************************************************************
 * Parts of this file are copied from the OOQP distribution and          *
 * are subject to the following license:                                 *
 *                                                                       *
 * COPYRIGHT 2001 UNIVERSITY OF CHICAGO                                  *
 *                                                                       *
 * The copyright holder hereby grants you royalty-free rights to use,    *
 * reproduce, prepare derivative works, and to redistribute this software*
 * to others, provided that any changes are clearly documented. This     *
 * software was authored by:                                             *
 *                                                                       *
 *   E. MICHAEL GERTZ      gertz@mcs.anl.gov                             *
 *   Mathematics and Computer Science Division                           *
 *   Argonne National Laboratory                                         *
 *   9700 S. Cass Avenue                                                 *
 *   Argonne, IL 60439-4844                                              *
 *                                                                       *
 *   STEPHEN J. WRIGHT     swright@cs.wisc.edu                           *
 *   Computer Sciences Department                                        *
 *   University of Wisconsin                                             *
 *   1210 West Dayton Street                                             *
 *   Madison, WI 53706   FAX: (608)262-9777                              *
 *                                                                       *
 * Any questions or comments may be directed to one of the authors.      *
 *                                                                       *
 * ARGONNE NATIONAL LABORATORY (ANL), WITH FACILITIES IN THE STATES OF   *
 * ILLINOIS AND IDAHO, IS OWNED BY THE UNITED STATES GOVERNMENT, AND     *
 * OPERATED BY THE UNIVERSITY OF CHICAGO UNDER PROVISION OF A CONTRACT   *
 * WITH THE DEPARTMENT OF ENERGY.                                        *
 *************************************************************************/

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TQpLinSolverSparse                                                   //
//                                                                      //
// Implements the aspects of the solvers for dense general QP           //
// formulation that are specific to the dense case.                     //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#include "Riostream.h"
#include "TQpLinSolverSparse.h"

ClassImp(TQpLinSolverSparse)

//______________________________________________________________________________
 TQpLinSolverSparse::TQpLinSolverSparse(TQpProbSparse *factory,TQpDataSparse *data) :
                    TQpLinSolverBase(factory,data)
{
  const Int_t n = factory->fNx+factory->fMy+factory->fMz;
  fKkt.ResizeTo(n,n);

  if (fMy > 0) data->PutAIntoAt(fKkt,fNx,    0);
  if (fMz > 0) data->PutCIntoAt(fKkt,fNx+fMy,0);                                     

  // trick to make sure that A and C are inserted symmetrically
  if (fMy > 0 || fMz > 0) {
    TMatrixDSparse tmp(TMatrixDSparse::kTransposed,fKkt);                 
    fKkt += tmp;
  }

  data->PutQIntoAt(fKkt,0,0); 
}

//______________________________________________________________________________
 void TQpLinSolverSparse::Factor(TQpDataBase *prob,TQpVar *vars)
{
  TQpLinSolverBase::Factor(prob,vars);
  fSolveSparse.SetMatrix(fKkt);
}

//______________________________________________________________________________
 TQpLinSolverSparse::TQpLinSolverSparse(const TQpLinSolverSparse &another) :
                    TQpLinSolverBase(another)
{
  *this = another;
}

//______________________________________________________________________________
 void TQpLinSolverSparse::PutXDiagonal(TVectorD &xdiag)
{
  TMatrixDSparseDiag diag(fKkt);
  for (Int_t i = 0; i < xdiag.GetNrows(); i++)
     diag[i] = xdiag[i];
}

//______________________________________________________________________________
 void TQpLinSolverSparse::PutZDiagonal(TVectorD &zdiag)
{
  TMatrixDSparseDiag diag(fKkt);
  for (Int_t i = 0; i < zdiag.GetNrows(); i++)
    diag[i+fNx+fMy] = zdiag[i];
}

//______________________________________________________________________________
 void TQpLinSolverSparse::SolveCompressed(TVectorD &compressedRhs)
{
  fSolveSparse.Solve(compressedRhs);
}

//______________________________________________________________________________
TQpLinSolverSparse &TQpLinSolverSparse::operator=(const TQpLinSolverSparse &source)
{
  if (this != &source) {
    TQpLinSolverBase::operator=(source);
    fKkt.ResizeTo(source.fKkt); fKkt = source.fKkt;
    fSolveSparse = source.fSolveSparse;
  }
  return *this;
}