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example/verySimple/cxx_main.cpp
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00004 //               Epetra: Linear Algebra Services Package 
00005 //                 Copyright 2011 Sandia Corporation
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00041 
00042 
00043 #include "Epetra_SerialComm.h"
00044 #include "Epetra_Map.h"
00045 #include "Epetra_Vector.h"
00046 #include "Epetra_Version.h"
00047 
00048 int main(int argc, char *argv[])
00049 {
00050 
00051   std::cout << Epetra_Version() << std::endl << std::endl;
00052 
00053   Epetra_SerialComm Comm;
00054 
00055   int NumElements = 1000;
00056 
00057   // Construct a Map with NumElements and index base of 0
00058   Epetra_Map Map(NumElements, 0, Comm);
00059 
00060   // Create x and b vectors
00061   Epetra_Vector x(Map);
00062   Epetra_Vector b(Map);
00063 
00064   b.Random();
00065   x.Update(2.0, b, 0.0); // x = 2*b
00066 
00067   double bnorm, xnorm;
00068   x.Norm2(&xnorm);
00069   b.Norm2(&bnorm);
00070 
00071   std::cout << "2 norm of x = " << xnorm << std::endl
00072        << "2 norm of b = " << bnorm << std::endl;
00073 
00074   return 0;
00075 }
00076 
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