example/verySimple/cxx_main.cpp

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00001 //@HEADER
00002 // ************************************************************************
00003 // 
00004 //               Epetra: Linear Algebra Services Package 
00005 //                 Copyright (2001) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
00025 // 
00026 // ************************************************************************
00027 //@HEADER
00028 
00029 #include "Epetra_SerialComm.h"
00030 #include "Epetra_Map.h"
00031 #include "Epetra_Vector.h"
00032 #include "Epetra_Version.h"
00033 
00034 int main(int argc, char *argv[])
00035 {
00036 
00037   cout << Epetra_Version() << endl << endl;
00038 
00039   Epetra_SerialComm Comm;
00040 
00041   int NumElements = 1000;
00042 
00043   // Construct a Map with NumElements and index base of 0
00044   Epetra_Map Map(NumElements, 0, Comm);
00045 
00046 
00047   // Create x and b vectors
00048   Epetra_Vector x(Map);
00049   Epetra_Vector b(Map);
00050 
00051   b.Random();
00052   x.Update(2.0, b, 0.0); // x = 2*b
00053 
00054   double bnorm, xnorm;
00055   x.Norm2(&xnorm);
00056   b.Norm2(&bnorm);
00057 
00058   cout << "2 norm of x = " << xnorm << endl
00059        << "2 norm of b = " << bnorm << endl;
00060 
00061   return 0;
00062 }
00063 

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