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// Didasko Tutorial Package
// Copyright (2005) Sandia Corporation
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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
#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