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example/verySimple_LL/cxx_main.cpp
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41 
42 
43 #include "Epetra_SerialComm.h"
44 #include "Epetra_Map.h"
45 #include "Epetra_Vector.h"
46 #include "Epetra_Version.h"
47 
48 int main(int argc, char *argv[])
49 {
50 
51  std::cout << Epetra_Version() << std::endl << std::endl;
52 
53  Epetra_SerialComm Comm;
54 
55  int NumElements = 1000;
56 
57  // Construct a Map with NumElements and index base of 0
58  Epetra_Map Map(NumElements, 0, Comm);
59 
60  // Create x and b vectors
61  Epetra_Vector x(Map);
62  Epetra_Vector b(Map);
63 
64  b.Random();
65  x.Update(2.0, b, 0.0); // x = 2*b
66 
67  double bnorm, xnorm;
68  x.Norm2(&xnorm);
69  b.Norm2(&bnorm);
70 
71  std::cout << "2 norm of x = " << xnorm << std::endl
72  << "2 norm of b = " << bnorm << std::endl;
73 
74  return 0;
75 }
76 
Epetra_Map: A class for partitioning vectors and matrices.
Definition: Epetra_Map.h:119
int Random()
Set multi-vector values to random numbers.
Epetra_Vector: A class for constructing and using dense vectors on a parallel computer.
std::string Epetra_Version()
Epetra_SerialComm: The Epetra Serial Communication Class.
int Update(double ScalarA, const Epetra_MultiVector &A, double ScalarThis)
Update multi-vector values with scaled values of A, this = ScalarThis*this + ScalarA*A.
int Norm2(double *Result) const
Compute 2-norm of each vector in multi-vector.
int main(int argc, char *argv[])