Didasko Development
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//                      Didasko Tutorial Package
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// Basic operations on vectors. The code defines two vectors and
// compute this dot product.

#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_Map.h"
#include "Epetra_Vector.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  

  // Total number of elements in the vector
  int NumElements = 5;

  // Construct a Map with NumElements and index base of 0
  Epetra_Map Map(NumElements, 0, Comm);

  // Create x and b vectors
  Epetra_Vector x(Map);
  Epetra_Vector b(Map);

  // set all the elements to a scalar value
  x.Random( );

  // random numbers
  b.Random();

  // minimum, maximum and average of vector
  double minval = 0.0;
  double maxval = 0.0;
  double aveval = 0.0;
  x.MinValue( &minval );
  x.MaxValue( &maxval );
  x.MeanValue( &aveval );
  cout << " min(x) = " << minval << endl;
  cout << " max(x) = " << maxval << endl;
  cout << " ave(x) = " << aveval << endl;

  // dot product
  double xdotb;
  x.Dot( b, &xdotb );
  cout << "x dot b = " << xdotb << endl;

  // total number of vectors, local and global dimension
  int NVecs, MySize, GloSize;
  NVecs = x.NumVectors(); 
  MySize = x.MyLength();
  GloSize = x.GlobalLength();
  cout << "Number of vectors = " << NVecs << endl;
  cout << "Local Size = " << MySize << endl;
  cout << "Global Size = " << GloSize << endl;

#ifdef HAVE_MPI
  MPI_Finalize();
#endif

  return( EXIT_SUCCESS );

}

#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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