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// Define dense serial matrices
// This code should be run with one process

#include "Didasko_ConfigDefs.h"
#if defined(HAVE_DIDASKO_EPETRA)

#include "Epetra_ConfigDefs.h"
#ifdef HAVE_MPI
#include "mpi.h"
#include "Epetra_MpiComm.h"
#else
#include "Epetra_SerialComm.h"
#endif
#include "Epetra_SerialDenseMatrix.h"

int main(int argc, char *argv[])
{
  
#ifdef HAVE_MPI
  MPI_Init(&argc, &argv);
  Epetra_MpiComm Comm(MPI_COMM_WORLD);
#else
  Epetra_SerialComm Comm;
#endif  

  // declare two dense matrix, whose dimensions are still not specified
  Epetra_SerialDenseMatrix A, B;
  
  // Total number of rows ans columns for dense matrix A
  int NumRowsA = 2, NumColsA = 2;

  // shape A
  A.Shape( NumRowsA, NumColsA );

  // set the element of A using the () operator.
  // Note that i is the row-index, and j the column-index
  for( int i=0 ; i<NumRowsA ; ++i ) 
    for( int j=0 ; j<NumColsA ; ++j ) 
      A(i,j) = i+100*j;

  // Epetra_SerialDenseMatrix overloads the << operator
  cout << A;

  // get matrix norms
  cout << "Inf norm of A = " << A.OneNorm() << endl;
  cout << "One norm of A = " << A.InfNorm() << endl;

  // now define an other matrix, B, for matrix multiplication
  int NumRowsB = 2, NumColsB=1;
  B.Shape(NumRowsB, NumColsB);

  // enter the values of B
  for( int i=0 ; i<NumRowsB ; ++i ) 
    for( int j=0 ; j<NumColsB ; ++j ) 
      B(i,j) = 11.0+i+100*j;

  cout << B;

  // define the matrix which will hold A * B
  Epetra_SerialDenseMatrix AtimesB;

  // same number of rows than A, same columns than B
  AtimesB.Shape(NumRowsA,NumColsB);  

  // A * B
  AtimesB.Multiply('N','N',1.0, A, B, 0.0);
  cout << AtimesB;

#ifdef HAVE_MPI
  MPI_Finalize();
#endif
  
} /* main */

#else

#include <stdlib.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
  puts("Please configure Didasko with:\n"
       "--enable-epetra");

  return 0;
}
#endif
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