EpetraExt_BTF_CrsGraph.cpp

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//     EpetraExt: Epetra Extended - Linear Algebra Services Package
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#include <EpetraExt_BTF_CrsGraph.h>

#include <Epetra_Import.h>
#include <Epetra_CrsGraph.h>
#include <Epetra_Map.h>

#include <vector>

using std::vector;

#define MATTRANS_F77 F77_FUNC(mattrans,MATTRANS)
#define GENBTF_F77   F77_FUNC(genbtf,GENBTF)
extern "C" {
extern void MATTRANS_F77( int*, int*, int*, int*, int*, int* );
extern void GENBTF_F77( int*, int*, int*, int*, int*, int*, int*, int*, int*,
                     int*, int*, int*, int*, int*, int*, int*, int*, int*,
                     int*, int*, int* );
}

namespace EpetraExt {

CrsGraph_BTF::
~CrsGraph_BTF()
{
  if( NewRowMap_ ) delete NewRowMap_;
  if( NewDomainMap_ ) delete NewDomainMap_;

  if( NewGraph_ ) delete NewGraph_;
}

CrsGraph_BTF::NewTypeRef
CrsGraph_BTF::
operator()( OriginalTypeRef orig )
{
  origObj_ = &orig;

  if( orig.RowMap().DistributedGlobal() )
  { cout << "FAIL for Global!\n"; abort(); }
  if( orig.IndicesAreGlobal() )
  { cout << "FAIL for Global Indices!\n"; abort(); }

  int n = orig.NumMyRows();
  int nnz = orig.NumMyNonzeros();

  //create std CRS format
  vector<int> ia(n+1,0);
  vector<int> ja(nnz);
  int cnt;
  for( int i = 0; i < n; ++i )
  {
    int * tmpP = &ja[ia[i]];
    orig.ExtractMyRowCopy( i, nnz-ia[i], cnt, tmpP );
    ia[i+1] = ia[i] + cnt;
  }

  //convert to Fortran indexing
  for( int i = 0; i < n+1; ++i ) ++ia[i];
  for( int i = 0; i < nnz; ++i ) ++ja[i];

#ifdef BTF_VERBOSE
  cout << "-----------------------------------------\n";
  cout << "CRS Format Graph\n";
  cout << "-----------------------------------------\n";
  for( int i = 0; i < n; ++i )
  {
    cout << i << ": " << ia[i+1] << ": ";
    for( int j = ia[i]-1; j<ia[i+1]-1; ++j )
      cout << " " << ja[j];
    cout << endl;
  }
  cout << "-----------------------------------------\n";
#endif

  vector<int> iat(n+1);
  vector<int> jat(nnz);
  int * jaf = &ja[0];
  int * iaf = &ia[0];
  int * jatf = &jat[0];
  int * iatf = &iat[0];
  MATTRANS_F77( &n, &n, jaf, iaf, jatf, iatf );
    
#ifdef BTF_VERBOSE
  cout << "-----------------------------------------\n";
  cout << "CCS Format Graph\n";
  cout << "-----------------------------------------\n";
  for( int i = 0; i < n; ++i )
  {
    cout << i << ": " << iat[i+1] << ": ";
    for( int j = iat[i]-1; j<iat[i+1]-1; ++j )
      cout << " " << jat[j];
    cout << endl;
  }
  cout << "-----------------------------------------\n";
#endif

  vector<int> w(10*n);

  vector<int> rowperm(n);
  vector<int> colperm(n);

  //horizontal block
  int nhrows, nhcols, hrzcmp;
  //square block
  int nsrows, sqcmpn;
  //vertial block
  int nvrows, nvcols, vrtcmp;

  vector<int> rcmstr(n+1);
  vector<int> ccmstr(n+1);

  int msglvl = 0;
  int output = 6;

  GENBTF_F77( &n, &n, &iat[0], &jat[0], &ia[0], &ja[0], &w[0],
          &rowperm[0], &colperm[0], &nhrows, &nhcols,
          &hrzcmp, &nsrows, &sqcmpn, &nvrows, &nvcols, &vrtcmp,
          &rcmstr[0], &ccmstr[0], &msglvl, &output );

  //convert back to C indexing
  for( int i = 0; i < n; ++i )
  {
    --rowperm[i];
    --colperm[i];
  }
  for( int i = 0; (i<n+1) && (rcmstr[i]!=n+1); ++i )
  {
    --rcmstr[i];
    --ccmstr[i];
  }

#ifdef BTF_VERBOSE
  cout << "-----------------------------------------\n";
  cout << "BTF Output\n";
  cout << "-----------------------------------------\n";
  cout << "RowPerm and ColPerm\n";
  for( int i = 0; i<n; ++i )
    cout << rowperm[i] << "\t" << colperm[i] << endl;
  if( hrzcmp )
  {
    cout << "Num Horizontal: Rows, Cols, Comps\n";
    cout << nhrows << "\t" << nhcols << "\t" << hrzcmp << endl;
  }
  cout << "Num Square: Rows, Comps\n";
  cout << nsrows << "\t" << sqcmpn << endl;
  if( vrtcmp )
  {
    cout << "Num Vertical: Rows, Cols, Comps\n";
    cout << nvrows << "\t" << nvcols << "\t" << vrtcmp << endl;
  }
  cout << "Row, Col of upper left pt in blocks\n";
  for( int i = 0; (i<n+1) && (rcmstr[i]!=n+1); ++i )
    cout << i << " " << rcmstr[i] << " " << ccmstr[i] << endl;
  cout << "-----------------------------------------\n";
#endif

  if( hrzcmp || vrtcmp )
  { cout << "FAILED! hrz cmp's:" << hrzcmp << " vrtcmp: " << vrtcmp << endl;
    exit(0); }

  //convert rowperm to OLD->NEW
  //reverse ordering of permutation to get upper triangular
  vector<int> rowperm_t( n );
  vector<int> colperm_t( n );
  for( int i = 0; i < n; ++i )
  {
//    rowperm_t[ rowperm[i] ] = n-i;
//    colperm[i] = n-colperm[i];
    rowperm_t[i] = rowperm[(n-1)-i];
    colperm_t[i] = colperm[(n-1)-i];
  }

  //Generate New Domain and Range Maps
  //for now, assume they start out as identical
  const Epetra_BlockMap & OldMap = orig.RowMap();
  vector<int> myElements( n );
  OldMap.MyGlobalElements( &myElements[0] );

  vector<int> newDomainElements( n );
  vector<int> newRangeElements( n );
  for( int i = 0; i < n; ++i )
  {
    newDomainElements[ i ] = myElements[ rowperm_t[i] ];
    newRangeElements[ i ] = myElements[ colperm_t[i] ];
cout << i << "\t" << rowperm_t[i] << "\t" << colperm[i] << "\t" << myElements[i] << endl;
  }

  NewRowMap_ = new Epetra_Map( n, n, &newDomainElements[0], OldMap.IndexBase(), OldMap.Comm() );
  NewDomainMap_ = new Epetra_Map( n, n, &newRangeElements[0], OldMap.IndexBase(), OldMap.Comm() );

#ifdef BTF_VERBOSE
  cout << "New Row Map\n";
  cout << *RowMap << endl;
  cout << "New Domain Map\n";
  cout << *DomainMap << endl;
#endif

  //Generate New Graph
  NewGraph_ = new Epetra_CrsGraph( Copy, *NewRowMap_, 0 );
  Epetra_Import Importer( *NewRowMap_, OldMap );
  NewGraph_->Import( orig, Importer, Insert );
  NewGraph_->FillComplete( *NewDomainMap_, *NewRowMap_ );

#ifdef BTF_VERBOSE
  cout << "New CrsGraph\n";
  cout << *NewGraph_ << endl;
#endif

  newObj_ = NewGraph_;

  return *NewGraph_;
}

} //namespace EpetraExt