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// ***********************************************************************
//
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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// Lesser General Public License for more details.
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// Define dense serial matrices
// This code should be run with one process

#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[])
{